Well i have to join in whenever one of my favourite Champions in League of Legends does their signature voice clip. Even if they are on the other team.
Some of the more awesome ones include:
"DEMACIA!"
Garen
"Haaaaa DEMACIA! *pew*"
Lux
"DEMACIA!"
Jarven IV
To name but a few.
Current favourite is of course Nocturne's "DARKNESS!" just for the sheer panic it brings upon the entire enemy team. You know some poor low health fool is shitting himself waiting for you to swoop down and instakill him with your dash, fear, soil combo.
Double points if he uses the simple evil chuckle voice clip. So awesome.
And Sejuani's "STAMPEDE!" *epic charge over a wall*
Oh and in LoL people will flame you for doing well, for doing shit, for doing neutral, for apparently killstealing in a teamfight situation, for landing clutch stuns and bindings (HAX/LUCK!) and so on so just take off those badass sunglasses and say:
"Please, cry harder"
Also anyone who uses the in-game taunt button in a fighting game after the game is over is a complete ****. No exceptions.
Though if you manage to type /l or /d or /t during an escape in LoL and actually get out you're just cool. Unless you're playing Master Yi. You can spam /t, get up and make some tea then still get out easily because the speed buff ultimate is just that good.