For more hilarity, half-submerge a spoon while in the milk just before freezing the whole bowl. they're going to pull and pull and pull on the spoon just before ultimately working out what's going on.
After the prank https://keirankmxx728556.blogchaat.com/34010539/the-best-side-of-harmless-and-hilarious-food-pranks-for-april-fool-s-day