"The Golf Ball Paradox": throw a golf ball (or squash ball) into a cylinder and it pops back out (without touching the bottom)
Video by Steve Mould:
https://www.youtube.com/watch?v=5sbM2Isx17A
Mathematical analys:
(1) "Golfer's Dilemma", Marco Gualtieri et al, June 1 2006, American Journal of Physics, https://doi.org/10.1119/1.2180281
(2) "On a simple formulation of the golf ball paradox", O Pujol et al, Feruary 27 2007, European Journal of Physics, https://doi.org/10.1088/0143-0807/28/2/024
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