What would you rather drink?

It's my birthday and everyone's out partying without me. I don't mind, I'm watching cee lo green on tv and drinking and generally having a good time. Unfortunately my alcohol supply is ebbing and I've only got a bit of a buzz, fo srs. My question to you is this: if you were in my position, would you rather drink normal alcohol that belongs to someone else, alcopops and cider etc. (my sisters', pretty weak stuff and they wouldn't mind as long as I bought them more for the weekend) or would you drink your bottle of 18th birthday champagne alone?