Stop reading if you've heard this one.

Why did the sea turtle cross the Florida Keys? To go to the doctor.

A loggerhead sea turtle nearly swam to the door step of the Florida Keys Turtle Hospital, the only licensed veterinary facility in the world that solely treats sea turtles.

The 73-pound reptile was suffering from a bacterial infection and somehow knew exactly where to go for help -- no Yellow Pages needed.

Staff members at the hospital actually waited several hours before treating the turtle because they thought it may have just been lost when it showed up at the dock of the treatment center.

But the turtle stuck around, probably unaware of the Turtle Hospital's "no walk-ins" policy.

Eventually, he was treated with meds and now has a new home in a blue tank until he's all better.

No doubt, the hospital will get plenty of referrals from their new patient when he is back with his friends -- Michelangelo, Leonardo, Donatello and Raphael.