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It's more like a frisbee, with 'nerf' safety edges and anti-pollution thrusters. Definitely dense, but it flies better with all that extra weight.

I'll have to collect some rainbows and build me one of those. Stand on the side of the road and throw it at traffic, since it's safe.

It's safe as pie. Oh yeah, be sure to wad the rainbows up well; that bow shape, like you said, boomerang. Doesn't hurt when it hits, but damn.

Boomerang rainbow pie!