It was a tradition at Boys' Brigade camp to send a youngster to the officers tent for a 'long weight' or 'sky hooks'. I suspect I was both perpetrator and victim.
The worst work prank I played, and nearly got myself sacked for, was giving some of the warehouse men Belgian chocolate.
One of them ate it and about an hour later the door to the main floor came flying open and he was sprinting the loo and apparently banging on the door yelling for the sitting...