The Rotting Man - vectorized illustration originally on ink and paper
There's a small narrative to this one. Once while riding on the bus (in Chicago) this lady in the back was on the phone (maybe with an imaginary person)
Anytime she said something she'd follow it with a "NA NA NA NA NA NA NA" It progressively got louder and to the point where it annoyed the bus driver enough for him to yell "Hey you in the back making them animal noises, you better stop right now! Quit acting like your crazy because I know you're not!) She politely replied OK but continued less audibly.