But I'm coming around, starting with the guy who jumped off a balloon at 100,000 feet above the ground.
This race nearly has me convinced. It is a world-wide event with everybody starting at precisely the same time (10 am GMT) and running at a set minimum pace until they cannot hold pace any longer. Sort of.
Here are the rules in short form:
A fuller read of the rules (at this link) shows how diabolical this is. Runners start 30' before the follow car. When the car starts, it begins at just slower than a 6'/mile pace. It speeds up every hour until, at 3:30 pm GMT, it reaches a top speed of 21.75 mph -- under a 3' mile. When the car catches you, you are out. The winner, of course, is the one who lasts the longest.
You can calculate how the car will progress: in the first 1/2 hour it goes nowhere; then it covers 15 kilometers between 30 and 90 minutes; then 16 kilometers from minutes 91 to 150; and 17 kilometers from 151 to 210. At 2 1/2 hours the car is 31 km (17 miles) in, at 3 hours it is 39.5 (25 miles) in, and at 3.5 it is 48 km (30 miles) in. Then the car goes on a sprint to catch the leaders at 20 km/hour -- thus hitting 58 km (36 miles) at 4 hours, 68 km (43 miles) at 4.5 hours and 88 (55 miles) at 5.5 hours -- and finally running people down at 35 km/hour if anybody survives until 3:30 pm.
Where would you be when you got caught? Where will the top athletes be? Even if the courses are flat and the weather is good, I am guessing the top talent falls before the final sprint begins at 3:30. Don Ritchie (Britain, 1983) holds the 50-mile world record in a blistering 4:50, and he lacked the psychological challenge of not knowing when he would be done. Holding a 6'/mile pace in the face of uncertainty seems just short of possible.
Why is this so cool? For the regular amateur athlete you just get to run until you get overtaken, which is at least unique. For the competitors the rules are the same, but you have no way of knowing how your competition -- which may be in an entirely different forum -- is faring.