Thirty Jokes

Did you hear about the famous microbiologist who traveled in thirty different countries and learned to speak six languages? He was a man of many cultures.
"The most remarkable thing about my mother is that for thirty years she served the family nothing but leftovers. The original meal has never been found."
— Calvin Trillin
If a monkey has thirty bananas in one hand and forty bananas in the other hand, what does he have?
Very big hands.