Absolutely... took my dog for a walk on the beach a few years back. Threw a ball for him back towards the cliffs.
Strangely, he didn't bring it back, but sat down and waited for me to go to him.
When I got there I was astounded to see him sitting in between some old rockets and bombs!... Got him away from them and ran back to the camp site and got the manager to ring the bomb squad, who subsequently came out.
Apparently it was a common occurrence as the area at the top of the cliffs I had been walking the dog along, was an old RAF bombing range during WWII, and after a storm, parts of the cliff face would collapse and old ordinance would end up on the beach...