My Grandfather was a ARP Warden during the Blitz and told of this actual event.
After the war ended , he did a bit of gardening and "found" a incendiary device outside in his garden, up against a wall
Next morning he carried it to the local Police Station ) .. and they all scattered... complete with howls and screams
(1st door from the right, of the picture of the old Wavertree Police Station, now a Pub.)
When I was a baby from 1962, I lived up the side entrance (far left of picture).
After placing it in a big bucket of water over night, they had some one check it over, it was officially deemed safe.
It stayed in that bucket for days/weeks.. He only lived down the Road and when he went back one day, he reclaimed it.
I still have it to this day.. and here it is, recreated 70 years later