Ya know, there have been WAY to many things I have seen weird horse people do, and it would be hard to name a few. But one, there is a lady at the barn I work at who, when she washes her horse, always has to first stick the hose nozzle in the horses mouth and spray it. One time she forgot to do it first, and the horse went bonkers on her. When she did spray his mouth, he was perfectly fine.
The things we horse people do for our horses enjoyment... -.-