Photos: The eight most surreal photos from Australian Open Kids Day

They don't call it the "Happy Slam" for nothing. (Graham Denholm/Getty Images)

MELBOURNE, Australia -- Tennis' best came together to entertain the young ones at the Australian Open Kids Day on Saturday, which led to some surreal scenes on Rod Laver Arena.

Roger Federer, Rafael Nadal, Victoria Azarenka, Lleyton Hewitt and others yucked it up on court alongside Teenage Mutant Ninja Turtles, Dora the Explorer and Spongebob SquarePants.

Here are some of the wackiest moments from a fun afternoon:

Rafael Nadal: When Rafael met Raphael. (Paul Crock/AFP/Getty Images)

Lleyton Hewitt: I don't know how they did it in the old days, Lleyton, but I'm pretty sure you can't do that. Just ask Novak Djokovic. (Aijaz Rahi/AP)

Roger Federer: He really wasn't kidding about moving to a larger racket frame. (Paul Crock/AFP/Getty Images)

Rafael Nadal: Potential mixed doubles team? Rafa is exploring the idea. (Paul Crock/AFP/Getty Images)

Federer: The Federer twins are going to be so jealous. (Eugene Hoshiko/AP)

Victoria Azarenka and Federer: That's just good teamwork. (Aijaz Rahi/AP)

Nadal: Nice photobomb, Michaelangelo. (Darrian Traynor/Getty Images)

Everyone: Sadly, there were no photos of Nadal biting the Golden Spongebob trophy. Maybe next year! (Graham Denholm/Getty Images)