One of the more significant pet peeves that DJ's have are song requests. Not only the request themselves, but also how people go about requesting them.
Our friends over at Do Androids Dance have compiled a hilarious (and somewhat depressing) collection of song request notes that individuals have left for DJ's while they were performing. Some are pretty straight-forward (see above), while others get a little nasty. If there's anything you learn from this list, it's this: don't be "that" guy at the club. Thanks us later.