CCP Games holds an event every year in Iceland called Fanfest where they invite players for EVE Online out to hangout with devs, drink, party, learn about upcoming EVE Online changes, etc.

I bring this up because most years they do something crazy for one of the nights. Back in 2011 they did a chessboxing match.

Here was there promo/announcement video: https://www.youtube.com/watch?v=YaBWBmYfqVQ

And the actual match: https://www.youtube.com/watch?v=TJy2kIWtyvQ

It was pretty crazy. It's one thing to know whats going to happen, but when blood actually started being drawn it just went to a whole new level.