4. When you're at a party and you're drunk, and you're with your girlfriend, and you call her your ex's name.
3. Hobos get more sex than you, while you're drunk.
2. When you happen to drinking, and you're so drunk you make out with a hot chick, that you learn is your brother's wife.
And the top reason why you shouldn't be a drunk is...
1. You can't tell the difference between a women, and a man.