Sun Xiaobao's joke, traffic lights, three roads in the middle, both sides are big pits. What was that again? Where can I find it?

One day, an aunt came to withdraw money, but I forgot the exact number. Anyway, the score is 50.

I want to find a whole book for her according to my work habits. I said, "Aunt, do you have fifty?"

Aunt paused, then smiled and said, "It's still fifty, and my children are over forty."