Love getting in the base and camping with an MK.

Pretty much the greatest thing to just see kill after kill come up, and your team just starts cracking up.
I've had several occassions when we were beating the other team so bad that I was in their base with a shottie, and I switch to a pistol to make it easier for them. Then I get 4 kills in a row not even trying.. rofl. I'm usually just like "OMG.. this is crazy *kill* WTF *kill* HOLY SHIT *kill*" and then finally they'll freak out and all charge at once and mow me down, or a stray grenade nails me.