This thread!! Lol!
When you have dreams that you're cutting your hair into a short style, Nooo! I Wake up so relieved.
When I'm at work writing down a regimen that I've been using forever....so why am I writing it?
When you count how many inches you need to reach a goal, and recount them, and recount again. And you count how many months it will take to get there.
When you take a shed hair and hold it against a ruler.
ETA: when you buy your hair products in bulk for fear that they might be discontinued.