Drinking really does make you funnier, but only when you are the judge. Researchers invited 12 comedians out for a night of drinking at a club and each was asked to come up with a joke, deliver it and then have another drink. They were also asked to rate their own jokes. All the jokes were later judged independently by a sober panel. The comics rated their jokes as the funniest after 4 or 5 drinks but the sober judges rated those jokes to be much less amusing and often actually offensive.
I also think I sing better after 4 or 5 drinks!