Most would say that death isn't funny. It isn't, unless you're Shaco - then it's hysterical. He is Valoran's first fully functioning homicidal comic; he jests until someone dies, and then he laughs. The figure that has come to be known as the Demon Jester is an enigma. No one fully agrees from whence he came, and Shaco never offers any details on his own. A popular belief is that Shaco is not of Runeterra - that he is a thing summoned from a dark and twisted world. Still others believe that he is the demonic manifestation of humanity's dark urges and therefore cannot be reasoned with. The most plausible belief is that Shaco is an assassin for hire, left to his own lunatic devices until his services are needed. Shaco certainly has proven himself to be a cunning individual, evading authorities at every turn who might seek him for questioning for some horrendous, law-breaking atrocity. While such scuttlebutt might reassure the native inhabitants of Valoran, it seems unimaginable that such a malfeasant figure is allowed to remain at large.

Whatever the truth of his history might be, Shaco has joined the League of Legends for reasons only he knows. He is a terrifying figure, typically shunned by both his fellow champions and the media at large. Only the summoners in the Institute of War know why such a creature was allowed into the League, but most Runeterrans suspect it to be a means that allows the power that be to keep an eye on the ever-elusive Shaco. Unsurprisingly, this champion is popular in places where madness can openly reign, such as among the power-hungry summoners of Zaun and Noxus.

Whatever you do, don't tell him you missed the punch line.

I am here writing this guide in order to give the fellow summoners and crafters of MOBAfire an idea, this idea came to me in the midst of urgent need, my team was in a game with only one possible "mid" but he disconnected during the loading screen, so my team being a bunch of people who " no hablo englea!!!" i decided ill take mid, knowing the true harassment and solo pushing power Shaco has i knew for a fact it would be viable and would work great, I immediately rushed to mid and grabbed Shaco's E ability, his one and only harass and ranged ability. So summoners I bring to you SHACO MID!!!!!!!!!!!!!!!!

Ranked from good to worse:
1-EXHAUST: Always grab this, the damage reduction is just too good to pass up
2-IGNITE: Stops their healing, great way to finish off running enemies or just to harrass.
3-TELEPORT: Lets you beable to shop but you will be killing the enemies so you'll shop then.
4-GHOST: Q is all i need to say
5-FLASH: ^^^^^^^^^^^^^^^^^^^^
6-CLEANSE: Shaco is very easily killed thanks to CC, if you see enemies stacking CC grab it
7-CLARITY: I do find myself harassing a lot or placing too many boxes, so i often run out of mana but if you're smart you shouldn't need this
8-RALLY:This can be insane for first blood or if your team is stacking dps/ad champs this will destroy in teamfights
9-HEAL: Stops your lifesteal so its not too good
10-REVIVE: Long CD and you wont be dying too much
11-FORTIFY: leave for tanks or supports
12-CLAIRVOYANCE: ^^^^^^^^^^^^^ plus your boxes act as wards
13-SMITE: Jungling only

Early Game:
This is your game time your enemy will see you mid and laugh, and wwill not stop, then they'll see you hitting 100's every time they get close, you will zone them and you will level insanely faster then them and you'll then be the one to laugh while the enemy cries and their teamates laugh at them and say "YOU SUCK YOU'RE LOSING MID TO A SHACO SHAUSHSUASHSUAHSUAHSUSA" <--- stupid *** annoying laughs

Mid Game:
This is when you'll be the one crying, if you jump in to fights you'll die, you want to stay far from them and don't go in till your whole team is in the fight then you jump in behind them and target squishies and place a box in middle of everyone. If you find yourself dying even then, just go to other lanes and push them about 3 waves of minions at a time, if you see their team keep going, if you don't, go back to other side of map, this is how you will annoy the enemies too no boundary so keep at it.

Late Game:
Late game? whats that Usually the enemy has surrender or you have already pushed their side lanes in and they lose from huge minion waves they ignored trying to find you.

Marks:
ArP - increases your damage greatly
Mpen - this will help you harass with you E and your R or W will help
Crit Dmg - with these your Q will do insane damage

Seals:
Hp5/Lvl- this will allow you to get in their faces with the harassment without worrying about their harassment
Cri Dmg- Same as marks
Health- same as the first seal but not as viable
HP5- not as good as hp5/lvl since at lvl 4 those do as much as these do but they keep increasing
Dodge- Who doesnt love these, but you dont have the mastery for it so its not too great.
Mp5/LVL- Meh i usually don't need.

Glyphs:
CDR/lvl- i like other one better
CDR- these just own for shacos midding power
AP- Helps your early game greatly
MR/lvl- shaco is quite squishy

Quint:
Crit dmg- these increase your q like noones buisness
ArP- same as marks, they just help alot
MPen- only if you dont have any others listed because these just anh
AP- same as glyphs
Health- Same as seals
Movement- Helps you get a hit and run quick
XP- want to out level them even more? go for it

Starting items: Boots 2 HP and 1 Mana
Then get your boots > vampric scepter > sheen > inf edge > black cleaver > bloodthrister > trinity force > phantom dancer

This typically works for any team but replacing the black cleaver for situational items is what to do.
Ill give you some viable examples and when to use them.

Guardian Angel: whewn you find yourself focused and dying alot againest a well balanced team
Thornmail: fed yis fed trynds stuff like that
SotD: Jax
last whisper: high armor stackers that black cleaver just dont cut it for
madreds: againest high hp team
hex drinker: high ap team