Having a shower when you’re on tank water and its raining is pretty cool. And I’m going to sound like a stoner here (I’m not one), cos you start thinking ‘water comes in, water goes out and I’m the middle!’
If you’re not on tank water or for some reason live in a desert, try drinking while peeing. Its pretty similar. You’re like hehehehehehheh science. The human fountain? Although maybe if you’re in a desert, you should be drinking your own urine or something. Which I guess is more realistic to how a fountain works and lets face it, would be extremely hard without a cup..