This is why you should always look before you sit. Going to the hospital for a nail in your butt is never a good look.
The Proof of the Pudding (is in the Eating)
saying (also the proof is in the pudding)
said to mean that you can only judge the quality of something after you have tried, used, or experienced it
Cambridge Dictionary
24 jul. 2020
Welcome to the world-famous Just for Laughs Gags, we’ve been playing silly pranks on unsuspecting people in public and capturing hilarious reactions with hidden cameras.