How many beans are there in Irish chili?
Answer: 239
Why are there two hundred and thirty-nine?
Answer: (spoken in Irish Brogues) Because if you add one more, it'd be "two farty."
Alright listen up, buttercup. The joke is about the number of beans in Irish chili. The punchline is a play on words using an Irish accent, turning "two forty" into "two farty." You probably don't get it because you're too busy eating crayons.