I've found wheel weights, staples, a piece of 1/4" rebar that was about 4" long, pieces of a beer bottle, a nail that was about 6" long that went through the tread and came out halfway down the sidewall, and a car key. I'm sure there'* more that I'm forgetting.
there is a guy in the club that has one, it fell apart in a few months. the suspension came completely off when he took it to hatfield the first time. and the other polaris he bought broke too so he didnt even get to ride at all on vacation. there is a reason polaris'* are so cheap