Princes William And Harry Pull Phone Joke On Queen Elizabeth March 5, 2007 - Queen Elizabeth

Who doesn't like to have a little fun and games with their grandparent, in an attempt to loosen them up? Britain's young royals sure do, and they knew the perfect formula to have a good laugh with Her Majesty.

Princes William and Harry played a prank on their grandmother, Queen Elizabeth, by recording her voicemail to say "wassup!"

The royal brothers thought it would be funny to record the answering machine joke when the queen asked for help setting up her the voicemail on her cell phone.

The recorded message said, "This is Liz. Sorry I'm away from the throne. For a hotline to Philip, press one. For Charles, press two. And for the corgis, press three."

A source told Britain's Daily Star newspaper, "The queen was mortified at first - she does like to maintain a formal presence at all times. But then she really saw the funny side, and had a little chuckle to herself when she thought about which VIPs might have heard it.

"It was the talk of the Buckingham Palace - and the royal family."

William, 24, and Harry, 22, also taught their royal grandmother how to send text messages.

The 80-year-old queen often uses her cell phone to communicate with the princes and her other grandchildren.