This one was easy right? Let's go.
The joke:
The past, the present, and the future walked into a bar…
You know what?.... It was tense!
Explanation:
Past, present, and future are verb tenses in English.
When they “walked into a bar,” that situation becomes tense.
The punchline “It was tense!” works in two ways:
Emotionally tense (awkward or uncomfortable)
Grammatically tense (because past, present, and future are tenses)
So the humor comes from the double meaning of the word “tense.”