A holiday resort on the Isle of Wight was evacuated when a guest brought back an "old hand grenade" he found after reportedly thinking it was a fossil.
https://news.sky.com/story/isle-of-wight-holiday-park-evacuated-after-guest-brings-hand-grenade-he-mistook-for-fossil-11791960
A Royal Navy bomb disposal team was called to the Whitecliff Bay centre in Bembridge following the discovery on Thursday night.
Local media reported that the guest found the device on a beach and carried it back to the caravan he was sharing with his family, thinking it was a fossil.
Away Resorts Management (ARM), which runs the holiday park, said the "old hand grenade" was retrieved by the bomb disposal team and guests were moved to a safe area while a controlled explosion was carried out.
It’s unclear quite which geological era this amateur geologist thought his find dated from:- The Pre-Cambrian Fragmentation Era perhaps ?