Collection of Tongue Twisters

Say what?

To sit in solemn silence in a dull dark dock
In a pestilential prison with a life long lock
Awaiting the sensation of a short sharp shock
From a cheap and chippy chopper on a big black block.

Say that ten times fast. Then visit a huge collection of tongue twisters. The quote above, by the way, is from Gilbert and Sullivan's The Mikado.