if you have 2 friends with you, so its you 3 and the single gets on, talk about how you had a gang bang the night before and be disgustingly graphic, then when your bout to get off, ask what hes doin later.
^^ that is how I usually spend my time. Speak in a loud and clear voice to your buddy how hot the gang bang was last night and that you hope no one got crabs this time. Last year I asked one of my chick friends I was boarding with how the surgery went and if she was getting used to having a penis. The 50 year old women on the lift was mortified.
Another one of my personal favorite is put arms up and lock your fingers behind your head and have one of your buddies bob their head like they're giving you a blow job. You get some funny looks. I don't know why but I love being an ass at the hill :P