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Originally posted by TheTruthinessHurts
The moving can one is a classic:
Its due to it being hot, as you described it. You put it down on the surface (Probably a smooth one right?) and the heat of the can heats up the normal temperature air trapped underneath it, which expands and lifts the can slightly in minute jumps, just enough to let out a bit of air, lifting the can the same way a hovercraft does. The surface is slightly tilted one way or another (no surface is ever 100% spirit-level flat without a lot of effort expended) so the can slides 'downhill', however slight the slop might be.