See yourself become someone else.

You and a partner sit on opposite sides of a “two-way” mirror. You vary the amount of light illuminating your face while your partner varies the amount of light illuminating his or her face. As you adjust the light, you will see yourself gradually assume aspects of your partner’s features, [...]

Some light sources may appear to wiggle and flash when you give them the raspberry, but the only thing wiggling is you

Some light sources flash on and off many times a second. When you give them the “Bronx cheer,” you can see the their hidden flickering. [...]