BUGS! bugs! n' more BUGS!

A limerick:

There was an Old Man in a tree,
Who was horribly bored by a Bee;
     When they said, 'Does it buzz?'
     He replied, 'Yes, it does!'
'It's a regular brute of a Bee!'

Tongue twisters: 

Busy buzzing bumblebees.

Friendly fleas and fire flies.