Two almonds walk into a bar and order drinks
Two almonds walk into a bar and order drinks. The bartender looks at them incredulously and exclaims, "I can't serve you! What are you, nuts?!?"
This joke is a pun based on the fact that the word nuts can be both the plural of the nut food group (which is a noun), and also a colloquial (adjective) that means crazy.
The answer is "Yes, they are nuts" or "No, they aren't nuts" depending on which definition of nuts the bartender was using.