Gramps here: Cyclists beware. As kimsjosh notes below, goathead thorns are very plentiful. They trash tires.
I almost want to say don't bother with this one. Don't bother to take the keys out of the ignition. Certainly don't bother to close your door.
Kitty here: This is, like, totally, like, boring. Bibbro says I can't use the words I want to use for this one. Not in the dirt. Not in the rocks. Not in the bushes. What rocks? What bushes?