* "The comedian told a funny joke about cats." (This uses "joke" as a noun.)
* "I couldn't help but laugh when my friend joked about my messy hair." (This uses "joke" as a verb.)
* "He was always making jokes, even when the situation was serious." (This uses "joke" as a noun, referring to the act of making jokes.)
* "The joke was on him when he tripped and fell." (This uses "joke" as a noun, referring to a situation where someone is tricked or made the subject of a humorous situation.)
The meaning of "joke" can change depending on the context of the sentence.