Small talk. I hate when my Wife has us hosts a party and I have to sit there talking to the Husbands/Boyfriends. Almost none of them are into anything interesting (Movies, NFL, MMA, Fishing, Cars, Beer, etc) so I'll fire up some '80s movies on Netflix and give them some beer (not the good stuff, obviously).
After about an hour, I'll "go to the bathroom" and then dip out to my game room (that I don't let them know I have) where I'll watch MMA or whatever's on. Periodically (like every 30-45 min) I'll sneak back into living room to offer them more beer and then sneak back into the bat cave. Rinse and repeat until they're about to leave and then I reappear at the front door to say "Thanks for stopping by!".