King's Quest III: To Heir is Human
When you are in the ships hold, when you are on top of the big crate, walk off to either side but do not let go of the direction key. This will confuse the game and will cause your character to mysteriously float around the room, up to the ceiling or wherever you move him, as if hes a ghost. (However, this bug leaves you unable to type commands, return to the ground, and is impossible to get out of, so make sure you save your game before you try it).
Added by Jayson Firestorm (153) on Aug 12, 2002
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