You have probably seen the video, or at least the picture, of Cameron Diaz feeding popcorn to boyfriend Alex Rodriguez at the Superbowl.

According to Diaz, it was a playful moment when Rodriguez reached for one of the last pieces of popcorn in the bucket, and she denied him. Then, she told him, "You know what, I love you too much. I'm gonna give it to you. You deserve it."

Letterman just wouldn't let it go, without a few lighthearted jabs....