OK... it's clearly a joke, but in keeping with its Shaquille O'Neal plays jockey theme, vitaminwater has taken out an ad in this weekend's Daily Racing Form that's an open letter from the former Heat center expressing his interest in running in the Kentucky Derby.

The company debuted an ad duing Super Bowl XLII in which O'Neal, who was traded to the Phoenix Suns in February, plays a jockey. The print ad says O'Neal wants to run in the derby.

It begins "dear friends at the national thoroughbred racing association and trainers, roll up your seersuckers, and put down your mint julep because i have some important news...the big diesel wants in the derby!"

O'Neal signed on with vitaminwater as an endorser and investor last year. The company has even created a web page for horsinaroundwithshaq which includes video and photos of O'Neal having fun at the track.