Ticketime is a concept design by Jacky Wu, Neo Chen & Eric Liu.
It's intended for use by airlines, to provide travellers with a wristband containing information about their flights, and would be returned once the customer's trip was completed.
The band is held on your wrist by two magnets, one on each end. In a clever twist, when the two magnets meet, they create a circuit that powers the display.
I would pay real money if I could get a watch like this for normal use, so let's hope someone takes this design into production sometime soon!