Busier than a one legged cat in a room full of rocking chairs.

Waitaminute.

Busier than a one legged rocking chair in a room full of cats.

Hmm, that ain't it either.

Too many pies in the fire?

Too many irons in the pie?

You can lead a horse to water but you can't make him fish?

Now I've just confused myself.

Oh well, it's all water over the bridge now.