I was standing next to Louie Awerbuck as he controlled a mover target while an LEO in class performed a select slug drill and I witnessed a 12g slug clip the brim of the trucker's cap on the mover, resulting in a hole through the crown of the hat and just grazing the target's rubber head.
After that, I decided that if I shot something and it didn't respond as expected, I should probably shoot it again as I most likely didn't get the hit I thought I did.