This is a vintage magic trick. You try to get the mummy of Tutankhamen back into his coffin, but when the magnet inside is tapped into the wrong position, King Tut won't lie down! The coffin is made with a magnetic metal base. If you tap the top he won't go back in but if you tap the bottom he goes in.
See the video below to see how it worked!
Video via Youtube emery 1978