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These are just great.

Activated by movement you really can catch your friends out with this one.

Set them up a drink in one of these and leave it on the bar for them. Every time they pick it up or put it down it activates the little willy in the bottom of the glass to flash on and off for around fifteen to twenty seconds.

Watch there face when they first notice it and then watch them try to hide it.

A great one for the bachelorette party or hens night.