Best prank I pulled was when we were given work at Broadmoor. One lad went to bits, not happy at all, was not even inside the main bit, was nurses quarters on the outside but he still was not happy. Now I spent many a year living in Bracknell which is a stones throw from the village of Crowthorne where Broadmoor is, so I was very familiar with the test siren, without fail, every Monday Morning, 10 am, 2 minutes escape siren, 2 minutes silence then 2 minutes all clear siren. So I told all the other lads about it, told them to keep it quiet from sissy boy, and the first Monday we were there, come 10, alarm went off and we all legged it to our cars pretending to panic. Sissy boy went to pieces.