"Rubber baby buggy bumpers" is child's play compared to this collection of tongue twisters from around the world. Some of them are a bit ridiculous:
Something in a thirty-acre thermal thicket of thorns and thistles thumped and thundered threatening the three-D thoughts of Matthew the thug - although, theatrically, it was only the thirteen-thousand thistles and thorns through the underneath of his thigh that the thirty year old thug thought of that morning.
Try out this one in Somali:
waxaan faley waan faleyba waxaanaan falin waad fashey maxaad iigu fashishay
I don't know what I just said but it was fun. Thanks to Miss Cellania over at Neatorama for pointing out this site.