Studio Don't : If your underage, don't try to get the engineer to buy you beer.
Since we're starting to veer into live sound talk...
A coupla weeks ago, some friends and I threw together a band for some big battle of the bands at the local college. It turned out to be a real amatuer affair when, among other things, each of the 2 soundmen were members of competing bands.
After our first song, I called to the soundman "Hey soundman, could you please get the fucking hi-hats, kick, and bass out of the fucking monitors?"