put your thinking cap on

"You may well put your thinking cap on, if you've got one.

"You've really got to put your thinking cap on with all the turns," said Moore.

You guys definitely need to put your thinking caps on and come up with a multi-media method for 2012.

So this is one that you really want to put your thinking caps on for because we're going to involve your mind.

You really have to put your thinking cap on and try to decipher what's really happening: Is it religion?

Put your thinking cap on, Sam.

So sharpen your pencils and put your thinking cap on.' '

Everybody put your thinking caps on and I don't want to hear a single word unless it has to do with how we can get ourselves out of here."