How fast can you say it?

Let's practice some Tongue Twisters...

A big black bug bit a big black dog on his big black nose

 http://learnenglishkids.britishcouncil.org/en/tongue-twisters/big-black-bug-0

If two witches were watching two watches, which witch would watch which watch?

http://learnenglishkids.britishcouncil.org/en/tongue-twisters/two-witches