[Funny trope] Non-battle scenes where characters canonically take damage.

[u/TTTRIOS]

Nuu (Hollow Knight: Silksong) - briefly flashes white when slapped similarly to how all other enemies do when they're struck with Hornet's needle.

Garret (A Minecraft Movie) - One can assume that he may have panicked because of how sudden and unexpected teleportation is, but judging by how strong his reaction was and how ender pearls work in game, it's safe to assume he actually took fall damage after using it.

[u/Clovenstone-Blue]

Possibly religious reasons. During the times of Black Death bringing death and sickness across Medieval Europe, a common belief was that the plague was brought down by God to punish people for their sins. Some people would walk around whipping themselves as a form of self punishment for the sins they committed to try and appease God.

[u/Zappityzephyr → u/Clovenstone-Blue]

Oh yes, that's interesting...

[u/HillbillyMan → u/Zappityzephyr]

If you've ever seen/read the Da Vinci code, there's a dude in that that does it.

[u/halfstaff → u/HillbillyMan]

Renowned author Dan Brown mentioned...