Rapaire is right, above. This behavior is too dangerous to joke about. Instead,use it as a chance to pass on a friendly warning.

"Just this June, a six-year-old Utah boy suffered serious burns after he slipped on a wet boardwalk in the Old Faithful area. The boy fell into hot water that had erupted from nearby West Triplet Geyser. He survived, but 20 park visitors have died, the most recent six years ago, scalded by boiling Yellowstone waters as hot as 250 degrees Fahrenheit."