I actually have an opposite problem, though. We stock the fridge with craft beer but since everyone is a health nut (I use it as a terms of endearment) no one wants beer at 6:00 so sometimes I end up being the only one and that feels awkward. But I've been at the office 11 hours, I want to treat myself.
Also, I find the thought of Beer Pong at the office to be very alarming. Foosball, sure, but Beer Pong? What are we, Freshmen in college?
But I'm in a East Coast office. We're annoyingly all business here. It is probably different elsewhere.