Here's Veritasium's Derek Muller with 5 Fun Physics Phenomena to bend your brain.

I feel like I have a pretty good handle on all of these, with the exception of the plastic cup/water demo (which I've always heard explained like this) and the teabag rocket, which – be right back, setting all my tea bags on fire. We'll be sure to update with the answers, but feel free to weigh in with your own ideas below.

Complement with instant ice and the bead-chain experiment.