Take my pants off ? Oo
Probably say "wtf" and then depending on your demeanor, attitude, and reasoning for being there act accordingly
put on some pants
offer you a drink, ask if you would like to stay and watch the game
Stand up and ask: "How the F* did you get here, and what are you doing here?"
I'll come and hug u :)
Offer you a drink and something to eat.... Here have some fried chicken :)
From the looks of your avatar, you're a skunk! I sneak away quietly. ...goooood skuuunkkkyyy
Pretend I don't see you and think to myself about how crappy I look.