I'm in the U.S. Take a wild guess =P
Hehe but really, here's some interesting facts on U.S. drinking laws:
Click Me! Scroll down to the bottom of the chart and start reading from there.
Interestingly enough, in SOME states it is legal to consume alcohol in a private setting, such as your own home, as long as a "family member" 21 years of age or older has consented to it(that could be really sketchy). What WILL get you in trouble is the purchase and public possession of alcohol which I guess refers to anything like owning a case of beer like you just bought ice cream at the super market.
But I think, from what we can gather from this topic, is that many people in nearly every country don't give a flying fuck about drinking laws, and do it anyway. Since you know, we either have been or all curious and stupid teenagers =P.