Wrestling fans are used to being written off as a subnormal minority but Wrestle Mania - World Wrestling Entertainment's biggest annual show - is less easy to write off. Wrestle Mania 31, which took place in Santa Carla, California, on Sunday, had more than 70000 fans travelling to the venue from more than 30 countries. It rivals any major sports event - and has the showmanship to outdo them all.Here's a few reasons why the event can brag that it's "the greatest sports event in the world".It's a "show"WWE rarely uses the term "wrestling", instead preferring to label itself "sports entertainment". With its pyrotechnic displays, set design, barmy ring entrances and the odd mini concert, Wrestle Mania is a true spectacle.Most wrestling shows last for around three hours but Wrestle Mania has grown into a week-long grappling extravaganza, filled with fan events, a Hall of Fame ceremony, and thousands of excitable adult men refusing to grow out of watching other men pretend to fight.It has dramaUnlike in other big sports events, drama is guaranteed at Wrestle Mania. It has more in common with a TV serial than a legitimate sporting contest. Heart-stopping near falls, grudges put to rest, friendships destroyed with one swing of a steel chair.No pain, no gainContrary to popular opinion, wrestling fans over the age of eight do know that wrestling isn't real. What they also know is that it isn't fake. Predetermined, yes. Choreographed, perhaps. But fake, no. Night after night, pro wrestlers put their bodies through punishments that would make most real sportsmen weep into their designer suits.Theatre, darlingWrestlers deserve credit for their talents as storytellers and dramatic performers. After all, this is a sport in which convincingly feigning injury improves the game, not ruins it.Celebs up for a rumbleEvery sports event has its "celebrity in the stands" moment (Bradley Cooper at Wimbledon, Rihanna pretending to like football at the World Cup) but at least some of the celebrities at Wrestle Mania have the decency to get involved with the in-ring action. Mr T, Mickey Rourke, Snoop Dogg and even Donald Trump have all got tasty at Wrestle Mania.The crowd's gone wildDue to the nature of professional wrestling, the crowd plays a huge part in the show. At Wrestle Mania the fans are at their most rabid, vociferous and beered-up.Compare that to the last few World Cup finals, at which 70000 singing fans couldn't stop the games from being about as interesting as watching paint dry.History in the makingWorld Wrestling Entertainment sees its premier show as the "Showcase of the Immortals", in which legends are born. OK, the sell is a trifle OTT but WWE's on-screen history is vast, ridiculous, and undeniably immersive. Just look at the "history-making" events of Wrestle Manias past, from the glory days of Hulk Hogan to Stone Cold Steve Austin and The Undertaker's 23-year Wrestle Mania undefeated streak.Everyone's a winnerSport fandom can be a stressful business but at Wrestle Mania, everybody wins. There are no sides, no rivalries, no punch-ups with opposing supporters. Ultimately, all wrestling fans really want is a great show. ..