I think there was an illustration in one of the Vampire books that had a malk kissing a fish.
I'd known the term, and then forgotten it, but recently was reminded of it. I was complaining about how some players just always want to be zany and wacky, instead of just playing to the premise. Like, you pitch a gritty game about hunting vampires in 1980s new york city, and they want to play a talking horse. or three kids in a trenchcoat. or a dead man's seeing eye dog. Just stuff that could kind of work, maybe, but is going to take a lot of work and take a lot of spotlight constantly. Instead of playing, I don't know... An investigative journalist who's been looking into mysterious deaths, a nurse at the hospital who's seen some shit, a business man who just can't get promoted (maybe because the owners are vampires).
Some of this is subjective, I guess, but I feel like some players are just not on my wavelength about what fits into a theme.