I collect flint
My father took me out when I was a boy and we would walk the farmer's plowed fields in the Spring to look for arrowheads. I must have found some enjoyment in it. I've been walking fields staring at dirt for over 40+ years now. That almost sounds depressing.
You never really know what you will find, sometimes the arrowheads are more modern. By that I mean, maybe 2000 years old and some are even older, possibly up to 12000 years old. Along with arrowheads, we've picked up stone tools, musket balls and once I found the striking flint out of a flintlock rifle. Some people may think its just picking up stones, but I always get a rush when I find something and realize that the last human being to touch this flint arrowhead or stone tool was 2000+ years ago.
Unfortunately it is a slow dying hobby. Modern farming machinery break up the flint and stone tools to pieces. Along with new growing techniques in farming, now farmers can plant their crops without plowing.
Below is a photo of two smaller arrowheads that I've found. You'll have to forgive my bad photo. Arrowheads don't fit well in my scanner
Jantz