Yellow butter, purple jelly, red jam, black bread.
Spread it thick, say it quick!
Yellow butter, purple jelly, red jam, black bread.
Spread it thicker, say it quicker!
Yellow butter, purple jelly, red jam, black bread.
Don’t eat with your mouth full!
Real rock wall, real rock wall, real rock wall
Many more at http://www.uebersetzung.at/twister/en.htm
For some more fun, try feeding some of the tongue twisters into this text to speech conversion tool, vozMe.