Where a man put his penis in a bee hive and proceeds to get stung then quickly shoves his penis in a females vagina and waits until it starts swelling up like a hot air balloon then yells, “up up and away!!!”

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

To inflate another's cheeks with one's fart.