And I've done a couple of those in Tesco. when I worked there I set all the kitchen timers to go off at near 30 second intervals. Great fun. Also at Christmas time we had these singing dolls so we set all of them off in a round...think Canon in Gigue D minor but with let it snow...
Also the best was again Christmas time. Get Do They know its christmas time on continuous loop and hide the cd player.
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