Not sure if this joke appeared before.
A man is sitting next to a woman who is trying to breast feed her baby in a bus.
The baby refuses to suck the breast and the mother warns, "if you don't suck, i shall give it to the uncle next to me". The baby still refuses.
After about 20 minutes, the woman repeats the "threat".
The man clear his throat and says "look, madam, you better make up your mind. I was supposed to get off 6 bus stops ago"