My mother teases another mother.

The other day my mom was at the store and saw ahead of her with her back turned towards her a former neighbor from growing up, who is married to my friend from high school and has two small sons, who were with her and talking but weren't noisy or anything...

Approaching from behind her, my mom was like, "Hey, can't you keep those children quiet?".

At that, my former neighbor from growing up spun around and all straight-faced was like, "Hey lady, these children are fine, we're not in a library!".

My mom, who works at the local library, was very impressed by her response, since she came up with it almost instantaneously.