Just curious. My wife and I are doing our first Tough Mudder event in Charlotte in November. It's basically a mud run that encompasses 10-12 miles with 20-25 various obstacles along the way. Some of the obstacles aren't really difficult, just unpleasant. The first obstacle is jumping into a commercial length dumpster full of ice water, submerging under a wall in the middle, and crawling back out the other side. The very last obstacle is running through a field of electrified wires that hang down, some of them having as much as 10,000 volts on them. Then there are the obstacles that are difficult such as the 12' walls, rings over a mud pit, increasing and decreasing slope monkey bars over a mud pit, etc. Here's the site if anyone wants to check it out. There are also a lot of vids on Youtube.
There are several similar events like Warrior Dash, Spartan Run, etc. I don't know much about them but from what I understand Tough Mudder is one of the toughest. Wish us luck!! I know it's a while off but I'll post some pics after for you guys to laugh at, lol.