I live in the region (West Flanders, Belgium) so here are some local stories.
* When my brother in law was a kid, he found an old bomb at the roadside and decided to take it home on his bike, saying things like 'Look what cool stuff I found'. Of course mom panicked and called the deminers. All friends came to look how the dismantling went.
* In fact I know plenty of people finding old grenades and stuff. People die every year messing with them at their kitchen table, even if everybody should know by now not to do that.
* Lots of farms have a heap of old bombs on the terrain. Once a year or so DOVO comes and picks them up.
* Polish people are used a lot as cheap builders and road workers. In general they dont understand Dutch (the local language) or even English. So while people try to warn them not to touch any strange metal things they find on building terrains, the message doesnt come trough (' Know nothing. Talk boss'). Nasty accidents happen as a result.
* A few years ago, an old lady dug up a hand granade from her vegetable garden. So she calls DOVO, the organisation that does the demining. DOVO responds something like no time, call back later. This pissed her off enough to throw the bloody thing in a bucket, drive to dovo, and give the bucket at the reception desk saying ' This is yours'.
While typing this, my wife asks why I'm typing on that nerd site of mine. So now she suggests going to the dunes 2 km from here and taking a photograph if I see one. Sorry guys, Im not messing with old bombs in the dark after the Brussels terrorist attacks, but yes, it's that easy.