From the "funny because it's true" file

A psychology professor had finished teaching his students about autism, and assigned a report. The guidelines were as follows.

• Find a professor in the history department who lies somewhere on the autistic spectrum. Interview that person, and ask about the challenges of working as a professor in the history department.
• Find a professor in the biology department who lies somewhere on the autistic spectrum. Interview that person, and ask about the challenges of working as a professor in the biology department.
• Find a professor in the math department who does not lie somewhere on the autistic spectrum. Interview that person, and ask about the challenges of working as a professor in the math department.

(I forget where I learned this joke, but every listener has found it hilarious. If the essence of humor is a kernel of truth, what does that say?)