This one didn’t happen to me but was considered something of an “initiation” a long time ago on the shift i was on.
At one of our training stations there was a room set up as a crime scene, complete with a fully clothed tailors dummy “murder victim”.
This was liberated late one autumn night and placed in the cemetery. The comms officer (who was in on it) asked the victim to investigate a report of “an unconscious male, not breathing” in the local cemetery at around 5 in the morning. The lad went along with his tutor and laughed out loud when he got within 20 or so yards of the “body” which was propped on a gravestone on a pile of leaves. He could clearly see what it was and realised that his colleagues were having him on.
What he didn’t realise, as he picked the dummy up to return it to its rightful place was that another of his colleagues was lying underneath the leaves. I can still hear the screams now 😆 .