Crowds have been and always will be the most important part of any sporting event. The action going on in the ring, Octagon or field would mean very little without the thousands in attendance going bananas over it.
That's why we need to remind ourselves from time to time of those instances where a home town audience, or genuinely shocked group of fans, react in a way that heightens the incident in question from noteworthy to legendary.
Just look at any notable sporting moment in the last 100 years. Do you think us English folks would hold David Beckham's free-kick (vs. Greece to qualify us for the 2002 World Cup) in such high esteem if the home fans hadn't lost their sh*t in such an iconic way?
Would Mike Tyson's ear biting of Evander Holyfield in 1997 be seen as one of the most shocking occurrences ever to be captured on film if not for the disapproving crowd voicing their opinion?
We can't ever be sure, but it'd be wise to assume that fans are there to be entertained and the UFC currently stands unopposed as the most entertaining competitive sport on the planet.