lowest common denominator

Einstein walks into a crowded room.

He asks the first man he sees, “What’s your IQ?” “242.”
Einstein says “Great! I’d love to talk about relativity and the shape of the universe with you.”

He asks a second guy his IQ. “145.” “Great,” Einstein replies “I look forward to talking about current events with you.”

Finally, Einstein asks a 3rd guy his IQ. His response is 65. Einstein replies “So, how bout those Steelers?”