If the wind changes

[rebbonk]

I was sitting on a bus behind a mother and her young son, her boy kept looking around and pulling funny faces at me.

After a few minutes I tired of his antics so I said "When I was a young boy my mother told me that if I made a ugly face and the wind changed I'd stay that way"

The little git replied

Spoiler:

"Well you can't say you weren't warned."