I found out this article listing 21 funny theme running races. People who doesn't run sometimes say that running is quite boring, because you go out there and just basically put one feet in front of the other ;-) They sure never saw any of THESE races!!
http://greatist.com/fitness/best-themed-running-races/
I am personnaly doing a Spartan race next spring (I heard you most likely need to be able to do a pull-up to do those. Uh-oh.) but I did not know the biggest part of the races in the list.
Would you dare a Nude Run in Finland? LOL