Oh man, do I remember the Rubik's Magic. Hours and hours of entertainment. I could "unlink" the rings in less than 5 seconds. We also used to see how many different things we could make -- a chair, box with lid, etc -- with it.

One thing I always hated, though, was what we called "the fix". If you folded things wrong, you could get the thing in a state where it wouldn't fold out flat anymore. You'd pop a string if you tried to force it. We'd have that thing laying around in "the fix" for weeks before someone accidentally did something to get it back to normal.

I think I might even actually still own one of those.