#3 Celebrities add an 'anything can happen' feel to events

Pro wrestling and sports entertainment are some of the most unique forms of entertainment in the world.
Where else can you see a superntural character (The Undertaker) take on a Sumo wrestler (Yokozuna) on the same show where Triple H takes a mud bath in a hog slop match?
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Given that wacky, zany sort of vibe, it's no secret that pro wrestling often embraces it nature rather than railing against it. No self respecting wrestling fan wants irony, not in that sense. Take the abysmal failure of Vince Russo's 'work the internet' angles in the fading days of WCW. No one wants to see Goldberg refuse to cooperate with the script and storm off. They want to see Goldberg in the context pro wrestling has provided.
One of the pro wrestling industry's greatest strengths is its anything can happen feel. When you bring in an outside celebrity, it enhances that anything can happen sensation, and helps 'wake up' fans who have become complacent viewers, predicting what's going to happen a few seconds or minutes before it occurs. If there's a celebrity involved, it's a deviation from the wrestling show norm, and therefore increases anticipation of something wild and off the cuff.
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