63-year-old guy in Elk River Minnesota (cue Grumpy Old Men) split up with his girlfriend, and when he learned that she immediately had a new boyfriend, he figured he'd prevent her from visiting that guy, by spreading screws on the road, every other day, for two months. 12,000 of them

Over 200 people filled out police reports for flat tires, several people who live in the area had to replace all four of their tires after they drove over them. A few had to replace their tires multiple times.

The Big Lake Police Department said incidents have been reported in Big Lake, Zimmerman, Orrock and rural Sherburne County over the last week.

https://www.facebook.com/SherbCoSheriff/posts/390626858304735
https://www.facebook.com/SherbCoSheriff/photos/a.113899765977447/391192764914811/?type=3&theater
http://www.fox9.com/news/police-nails-screws-thrown-in-roads-near-big-lake-suspects-sought