I thought this could be a kind of funny thread about things our parents told us in order to stop certain behaviors. Perhaps even what you tell your kids.
For example, my mom hated when I would bite my nails. So when I was little she told me biting my nails would give me worms. So I was so grossed out I stopped biting my nails.
She also told me eating dry instant noodles would give me worms.
I also used to put my long hair behind my ears and my mom told me if I kept doing that, my ears would start to stick out.
Then there were other warnings like don't go in certain areas or leave the yard or else the bogeyman would get me. That was one of my grandmas actually.
Or if I ate my beets, my cheeks would get rosy. That one never worked because I hated beets.
I'm sure some people have some really funny warnings their parents gave them.