Deer.
Deer are why a lot of guys don't drive their clown cars at night. That, and bugs the size of pie-plates.
... but mostly deer. I just got back from 100 mi in the speedster-- going nowhere in particular, just blasting around the roads I grew up on. The corn is shooting tassels, and the fawns born this spring are learning how to avoid automobiles. The preferred MO for these adolescents is to stand in a field munching corn stalks, hear the car, and bounce across the road looking for a stand of trees or a different field. Bonus points, if they change their mind as they misjudge the closing speed. At night, they're even more weird. I stopped in the middle of the road for one today, until he could decide to make a break for it to the right.
Deer are vermin.