[hijack]

Pfft. They are easy to disassemble and reassemble solved.

Or rotate one piece on a solved one, scramble it, and watch Mr. "I can solve any Rubik's cube in less than a minute" drive himself crazy.

Or peel off all the stickers and call it "The Idiot's Rubik Cube".

Then stare in horror when a friend asks "But how do you know when it's solved?"

In complete seriousness.

[/hijack]

I bought some graphite in solution to lube a door lock that was sticking. I didn't think I put in too much, but it took almost a half hour of "put the key in, work it around, pull it out, wipe off the excess and repeat" before the key would come back out clean. I don't recommend that.