Depends on what hobbies I share with them. Moviewatch like a mofo, gossip like a mofo. Have marathons of terrible or brilliant TV shows. Normally we'll have gone out somewhere first so we'll probably be pretty tired. Sometimes make ridiculous stupid food out of bits of stuff in the kitchen. Sometimes go outside when it's raining and act like idiots. Sometimes go outside when it's not raining and act like idiots. Sometimes spaz about books or animals or clothes or makeup or something. I draw with some of them and I game with some of them.

but then, I am a big nerdface so I'm not the right target for this question!