What's the banana knock knock joke?

The “Knock, knock” joke involving bananas and an orange is a classic example of a repetitive and anticipatory joke. It begins with the familiar “Knock, knock” setup, leading the listener to expect a punchline after the “Who’s there?” response. The joke subverts this expectation by repeating the “Banana” line multiple times, creating a pattern and anticipation for the listener. The humor culminates when the pattern is suddenly broken with “Orange,” followed by the punchline “ORANGE YOU GLAD I DIDN’T SAY BANANA!” This is a play on the phrase “Aren’t you glad I didn’t say banana?” The joke’s humor lies in the play on words, the buildup of anticipation, and the relief or surprise in the twist at the end, where the expected pattern is humorously disrupted.