There seem to be some regionalisms in regard to describing how useless someone/something is.
My mother used “Useless as tits on a nun” and “As useless as looking up a dead horse’s ass”, and from my uncle I heard “Useless as tits on a boar”.
Which ones have you learned or heard used by others?
I had an uncle who said this all the time when I was little except I always heard it as “tits on a board” which is just so very confusing for a kid. And if you’ve never pictured a pair of breasts on a see-saw… well, you probably have now that I’ve mentioned it.