In this situation i usually ring my friend Chuck
HP-15" / WIN7 x64 / 128GB SSD / TSP 2.6.8 / AUDITION CC / AUDIO 6 / DN-X1600 / X1 x2 / MIDI-Fighter SPECTRA / ATH-PRO500MK2 / CRANE STAND PRO
The only sabotage I've gotten is having the dj who plays the week before play every tone deaf request given to him. I know this feeds into the other 100 threads about terrible requests, but it is almost as bad as technical sabotage when you find yourself taken away from your set to explain why The Backstreet Boys were NEVER good and that you can't stop everything so you can download it.
Second biggest pet peeve is people who bring laptops/controllers who don't know how to interface in and/or do a proper transition without creating a sonic mess. If you can't get a solid beat matched using a controller to a CDJ, then just don't even try. Let the song end, have an ambient/beat-less track that serves as your intro and then go from there, but just getting into it and creating a mess is super annoying (and unprofessional) in my opinion.
Technics 1200-MK2; DJM-850; Maschine