Billionaire Richard Branson Reveals His Favorite Prank

— -- Watch your back around billionaire Richard Branson -- literally.

The Virgin Group founder and noted adventurer revealed in his blog this week that he has a penchant for pranks.

Branson shared one of his favorites to pull on guests visiting Necker Island, his private retreat in the British Virgin Islands, revealing that he likes "to get behind someone who is being massaged by a beautiful lady, and take over without them knowing."

"It's a good laugh to see their faces when they realize I'm not who they thought I was," he wrote.

The mogul said he enjoys being a "mischief maker" and considers having fun to be his cardinal rule in life.

"Nothing lightens the mood and lifts the spirit like a bit of harmless tomfoolery," he wrote.

If you ever find yourself around Branson, consider this your warning.