There are lots of crazy festivals and celebrations around the world. Like that wacky one in the UK where they chase a wheel of cheese down a steep hill. But if you think that one is crazy... you've got to check out the Exploding Hammer Festival, held every Fat Tuesday in San Juan de la Vega, Mexico.

This is pure insanity. Contestants rig a pile of explosives on the end of a sledgehammer. Then they smash them on the ground, effectively blowing everything within five or 10 feet into a cloud of dust. Witnesses say there are frequent injuries and that police and ambulance services are on stand-by during the celebrations.

Called "one of the most dangerous festivals in the world", they've been doing this for around 400 years. Boom.