classic. i've seen something similar before. i love the "take off your glasses" bit...as if that's the key!
dont know why but i also love the japanese ones where they just get a young girl to stand in a hotel corridor in a night dress (sort of like in the ring), and just stand there. the amount of people that nearly die as they walk past from fright!
my mistake, it was a latin american show:
This one is a superb mirror prank, just goes the extra mile (as its japanese!!)