By Amy Ryan
Updated March 17, 2007 at 05:11 AM EDT

Another PopWatch HeadScratcher to get you through the weekend:

What do these five performers have in common?

Sandra Bullock
Robert De Niro
Jennifer Lopez
Carlos Santana

Your answer should be as specific as possible. Send your best guess to sure to write “HeadScratcher” in the subject line and include yourfirst and last names in your e-mail. We’ll post the most interestingresponses Monday afternoon.