Some English Tongue Twisters

A tongue-twister is a phrase that is designed to be difficult to articulate properly. Tongue-twisters may rely on similar but distinct phonemes (e.g., s [s] and sh [?]), unfamiliar constructs in loanwords, or other features of a language.
Many tongue-twisters use a combination of alliteration and rhyme. They have two or three sequences of sounds, then the same sequences of sounds with some sounds exchanged. For example, She sells sea shells on the sea shore. The shells that she sells are sea shells I'm sure. or A black bug bit a big black bear, made a big black bear bleed blood.