Here's a good one that most, don't know the root from wince it came from.
"Veni, Vedi, Vici" (I came, I saw, I conquered)
-Julius Caesar
This is one that one of my fellow squaddies troughs out every now and then:
We came here to "KICK ARSE & CHEW BUBBLE GUM... but were all out of BUBBLE GUM!!!!"
I'm sure he got form somewhere.