I just came up with this one: Speak of the devil in the details.

And on the radio the other day a guy said "we shouldn't paint with broad brushes."

Kevin used the expression "I dug a hole and now I have to sleep in it."

This made me think of "You shit where you eat, and now you have to sleep in it."

Sounds smooth

I was watching Good Will Hunting, and I heard the mixed metaphor "Keep your ear to the grindstone"

Flash mob

It takes a village to tango.

This Title Intentionally Left Blank

A few that I thought of recently:

Out of the pan and into the kettle black
On the bleeding edge of your seat
Raining teeth and nails

Pig in a jacket

I wanted to post a few I can't up with recently:
Don't judge a book until you've walked a mile in its dust jacket.
Squealing like a stuck pig in a poke.

Cutting through the hoops

Ciamh came up with a good one (accidentally I might add):
There's a lot of red tape to jump through

It's not over until the fat lady comes home to roost.

A snowball's chance of freezing hell over

Smooth Dreams

Last night I was really tired and said to my wife, "I'm going to sleep like a baby's bottom."

old one

I don't know if I've posted this one or not, but here it is:
Wicked Red-headed stepmother

Cracked

Just talking to my friend Chloe about applying to grad schools, and I used the expression: "Putting all your eggs in someone else's basket."