Stopping on a Water Slide Leads to All Sorts of Pain
The first rule of water slides is you don't stop on water slides.
Don't believe it? Watch what happens to these girls when they do. The person right behind them comes at them full speed and knocks them down like bowling pins.
To be fair, the girls stopped and then started again when they realized someone was right on their tails. That put them in a no-win position (standing up turned out to be a bad idea). And while it's easy to point the finger at the whoever let the person behind them to go down the slide, the moral here is pretty clear: don't stop.