First, obtain a small wooden wedge with the thick end a couple of inches high, and with a shallow enough slope for a mouse to easily climb. Place it a couple of inches from a corner of the room, long end against one of the walls, high end facing the corner. Place a piece of cheese between the wedge and the corner. Erect a mouse-proof barrier, say a piece of glass, so as to force the mouse to go up the wedge to get to the cheese.
It may take a day or two, but the mouse will eventually find and eat the cheese. This is now day one. Replace the cheese. The mouse will return that night and eat the new piece of cheese. Repeat until the mouse has eaten six pieces of cheese. This is now day seven.
Do not replace the cheese. Instead, glue a fresh razor blade to the thick end of the wedge so the sharp edge sticks up three or four milimetres. Tonight, the mouse will run up the wedge, and move its head from side to side looking for the missing cheese.
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