Okay people. Whenever I murder someone in an online game, I usually spout out little catchphrases/battlecrys, like "For Narnia!" or "Sniper no sniping!" (three internets if anyone gets the reference) and the most common being; "WHAAAAALECOOOOOORE." I actually got a few friends to start yelling that too. It's quite intimidating.
SO
Go on and share thy catchphrases.
MGS Flash Collab ("Sniper Wolf, no sniping!"). A crossover flash between MGS and Dora The Explorer ("Can you say, Metal Gear?")
Mine vary between http://www.youtube.com/watch?v=LkCNJRfSZBU for trolling purposes, For Great Justice!, and the killstreak announcing variations on the theme of "You just got pwned, [censored]!" I don't use voice chat much though,, since this would get annoying fast.
PROTIP: Scream "LLLLLEEEERRRROOOOOYYY JJJEEEEEENNNKIIIINSSSS!" at the start of every Left 4 Dead match.