If you want to spend as little time as possible at a boring party but make it seem like you were there for a long time for the sake of whoever's party it is:
1) Arrive late, go straight to the host and say "Hey! I've been looking all over for you, where've you been?"
2) Buy him/her a drink, a fancy one too so they'll remember it (or mix a drink if it's a house party). This is so the next day or whenever you'll see them next, you can say something like "Hey.. how about that crazy shot we took together? What a great night."
3) Locate the host's camera and have as many photos as you can taken of yourself with different people. Try to have a different drink in your hand each time and make your clothes look progressively more disheveled (you may want to wind forward the clock on the camera before each photo if you know the host looks at these details).
4) Leave discreetly. You should've been in and out in 15-20 mins.
