Odds and Ends, But Mostly Odds

Soloqueue Surrender Conditions
(This is predicated on the condition that you are already getting stomped.)
As long as your team isn't raging at each other, then fight the game out, especially if you have some turrets to fight under. I've had quite a few games turn when the enemy team over commits to a fight under a turret (yes, even Nexus turrets) allowing our team a chance to get back in the game.
Doran's Items vs Wards
If you are at the fountain and your inventory slots are full and you still have a Doran's item, think about what your team needs right now. If it is wards then sell your Doran's item and pick up a stack of wards. If you know a fight is brewing and those extra stats will come in handy for that then keep the Doran's item.
Overconfidence
It is great that you are fed. Hi-five. Go you. Stop running straight up Mid without the rest of your team and dying to 3+ man picks. Get the rest of your team together so they can ward and act as meat shields while you do work…
(This is predicated on the condition that you are already getting stomped.)
As long as your team isn't raging at each other, then fight the game out, especially if you have some turrets to fight under. I've had quite a few games turn when the enemy team over commits to a fight under a turret (yes, even Nexus turrets) allowing our team a chance to get back in the game.
Doran's Items vs Wards
If you are at the fountain and your inventory slots are full and you still have a Doran's item, think about what your team needs right now. If it is wards then sell your Doran's item and pick up a stack of wards. If you know a fight is brewing and those extra stats will come in handy for that then keep the Doran's item.
Overconfidence
It is great that you are fed. Hi-five. Go you. Stop running straight up Mid without the rest of your team and dying to 3+ man picks. Get the rest of your team together so they can ward and act as meat shields while you do work…