I thought 'Black Bugs Blood" was hard.
Apparently there is a nonsense phrase out there that is 'impossible' to say ten times fast.
LINK I've said it at least five times to myself and I still can't remember the third word without looking at the phrase.
"Pad kid poured curd pulled cod'.
Thing is, I do know the Peter Piper tongue twister, and an 'S' based one - Sally sold seashells to shell shocked soldiers at the seashore - but not the seven silver snakes.
Hmm.
I wonder if there is a site that has all the known (and/or popular) tongue twisters. Well, the ones in the English language, cause I'm afraid I'd mangle the other languages.