i can pretty much trump most stories on what we found, we once found a live grenade
back in my plastering days we were pulling an old lath ceiling down in a cottage we were renovating, as as well as all the shite and dust , this stick thing fell down near one of us labourers, he goes whats that i goes i aint sure he picks it up [it was a german stick grenade, they dont look like a traditional grenade, a stick with a ball on the end.] we then noticed german markings on it any how puts it to one side and carried on. anyhow later in day an old boy on the job a sparky comes running into another room 'get the f**k out of here sharpish'in a mad panic, we though it was a gas leak or something, goes out side turns out hes a bit of a military buff and recognised it a as a german stick grenade that hadnt been used. long stary short we called in the bomb squad to deternate it.
so wed been working all day above a room with a live granade in, after a bit of reasearch turns out, the former fella that lived there had seen service in ww2 and must have picked it up in combat, the mad old bugger and stashed it under his floor so his missus or something didnt find it