A club owner once comes to me and says "this dude here is gonna take over for an hour or so, to show me what he got. Let him get on around midnight or so, ok?". Sure, you're the boss.
Midnight approaches, he comes to the booth to set up, I'm like... you brought your own needles, or wanna use mine? And he says "I'm just gonna use the laptop". I thought, okay, he's got some mixing software... why not, at least I get a break.
When he came on, I saw what this was gonna be... He used Winamp (honest to God, Winamp) for mixing songs. And not even two separate Winamps for some sort of transition, but one Winamp with some "fade out/in" plugin installed. As if that wasn't bad enough, the guy had awful MP3s. I'm talking low quality, and most of them taken from mixtapes with annoying shouts all over them. I was like WTF. I just spent 3h warming up just so you come up here and ruin the mood with your tracks stolen from some Dj Clue mixtape? Luckily, the club wasn't that full. And the boss wanted him to play, so I just got me a beer and waited him out.
Half an hour later, the owner asks me to "politely take over again". When I talked to the other DJ later on, he told me he is very interested in Djing, but was not prepared, and that it was basically a dare by his friends. Aha. At least they had the decency to cheer for him.