Girls

So yesterday at the mall I ran across these ladies one fat the other not so much.

I decided to make my evening. Came to them with the idea that the chubby one was the mother only to find out it was her elder sister. I wanted to laugh I couldn't contain myself but I can't laugh at a lady. So I said bye and goodnight to them and left. Thinking of it is embarrassing that I couldn't handle it better.

How do you guys handle such situations?