Hammacher Schlemmer's water-friendly giant mutant hamster ball looks like it could be the best water toy ever. Unfortunately, it doesn't actually work on water.

Oh, the ball floats like a champ, even with a 200lb guy inside (technically, it's rated to 170lbers, and we tested it with those guys too). But its suction cup skin, which promises to form a number of tiny vacuums on the surface of the water to provide some level of traction, are completely ineffective.

The end result is more of a stationary hamster wheel than a go-anywhere invincible hamster ball.

However, it should be mentioned that the ball works incredibly well on land. And for the whole weekend we watched a group of giggling kiteboard instructors step inside before being rolled down ramps, stairs and small ledges.

So you can find $300 worth of fun in Hammacher Schlemmer's Six Foot Walk On Water Ball, but you'll encounter that fun on land, not water.

Note: You may recognize that guy in the video. Just maybe.

Shot by Joel Johnson, Edited by Don Nguyen

Send an email to Mark Wilson, the author of this post, at mark@gizmodo.com.