"I'll never trust another trapezoid"
by Mark Frauenfelder from on (#2DB4K)
The guy in the cap doesn't get it, but the smart bald guy in glasses knows how it works. From the Bell Science Series film, "Gateways to the Mind" (1958).
Watch the full film (complete with nostalgically warbly soundtrack):https://youtu.be/-cAdxvl1jys