Train surfing is an extreme sport that you really definitely shouldn't try.

It's a pastime that's popular in South Africa and documented in the short film 'Staff Riding.'

Train surfing is pretty much what you think it is -- daredevils ride on top or the sides of trains while they whiz along the tracks at breakneck speeds.

As you might imagine, there have been horrifying injuries and death, but that doesn't appear to have turned people off from train surfing.