Played as Karthus, jumped in and died, but got their whole team to 1-2 bars of HP. Pressed ulti, then realized that it had five sec cooldown...

Thanks to jhoijhoi, Brynolf, Jeffy40hands, Samoh, MissMaw, Vavena, Koksei and The-Nameless-Bard for my signs
Playing Blitz with a randome Mf. I pull the enemy support and AD 2-3 into our tower so she can get easy kills. She farms bad the kills should compansate that. After 18 min she goes first back she is 7/0/0. She comes back with a Atam's Ninja Tabis and parts of Something else. Words can't express how badly I wanted to kill her at that moment.

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Playing Ashe bottom lane, doing OK I guess. I see our top lane (Riven IIRC) getting beat up bad and their Irelia is about to tower dive her for the kill.
I shoot an arrow top to help her out.
The arrow is a success, Irelia is stunned just outside of turret range.
Riven decides she can finish her off instead of recalling.
Charges in
Stun wears off of Irelia, she finishes off Riven and then recalls.
/facepalm.
I killed a teammate unintentionally.