Another Version
Betty Boughter bought some butter
But she said the butter's bitter
If I put it in my batter
It will make my batter bitter
But a bit of better butter will make it better than the bitter butter
So she bought a bit of better butter
And put it in her batter
And her batter was not bitter
So t'was Betty Boughter bought a bit if better butter and put it in her
batter and her batter was not bitter.
...and one for Gilbert & Sullivan fans (The Mikado):
To sit in solemn silence on a dull dark dock
In a pestilential prison with a lifelong lock
Awaiting the sensation of a short sharp shock
From a cheap and chippy chopper on a big black block.
(I imagine it's just as hard to sing it as to say it!

)
From this tantalising tongue twister territory:
http://home.pacific.net.sg/~santheep/twist.htm
Neo, hope your kids enjoy these!
Cheers
Mick