Veteran actor Billy Crystal took his wife on a scavenger hunt around Santa Monica, California for her birthday.

The When Harry Met Sally... star treated his partner Janice to a special outing over the weekend (15-16Mar14), taking part in the Fantastic Santa Monica Race - a wacky clue-based adventure game.

Video of the hunt shows the couple's friends Bette Midler and Rob Reiner joining them for the game, which involves completing a series of bizarre challenges and solving puzzles.