Don't get me wrong, I've seen a lot of very weird grips, and stances over the years. I usually just see non shooters or beginners limp wristing their semi autos. Many of them seem to like using an odd tea cup style grip, or hold their handgun like they're one of Charlie's Angels. These are the common errors that I find regularly at the range.
I stumbled across this video tonight, and thought that it was worth sharing since it might save someone an injury.
As always, pass it on if you know someone in need of a lesson and don't forget to subscribe.