How'd that get there?

I'm not generally the kind of person who enjoys surprises, but I really don't think I'd enjoy a surprise like this one:

A woman in the Western Canadian city of Edmonton, Alberta, discovered the suspicious package on Sunday and took it to her local police station, where officers told her to carefully place it on the lawn.

Police called in the bomb squad, which determined the item was a grenade, still in its packaging and belonging to the Canadian military.

The technicians made sure the package was secure and called military personnel in to dispose of the ordnance.

"It is quite unusual for someone to find a grenade in their backyard, especially one that hasn't been spent," Edmonton police spokeswoman Patrycia Chalupczynska said.

I would hope something like that is unusual. After all, when people begin to find explosives in their yards on a regular basis, that's a sign that something is deeply wrong.