Professional wrestling is 'built' on many things but, for the men and women bending bones inside the ring, it is mostly built on 'trust'. Performers put their bodies and their lives in the hands of their opponent(s) and it is up to them (to a degree) to make sure that they come out of the match in one piece and able to make it to the next town.
Wrestling is all about cooperation between parties and if that cooperation fails to materialise or breaks down entirely, it can make for some very interesting situations. The vast majority of pro wrestling matches pass without incident and everyone involved following the script as planned. Sometimes, however, wrestlers go into business for themselves and purposefully sabotage matches.
The reasons for doing so are varied, but more often than not it is due to a disagreement over the planned outcome.
Yes, wrestlers are sometimes so offended at being told that they're doing the job on that particular night that they ruin the contest for the fans, their opponent and the promotion that are housing it. It is, of course, totally unprofessional and usually results in the performer being blackballed from said promotion (if not a host of others), but that it isn't enough to stop some egomaniacs from doing it.
Here are eight times wrestlers purposefully sabotaged matches.