The Pneumarian Effect is when a heterosexual male has an unusual attraction towards another homosexual male, the homosexual usually being a close friend. This is usually a one off thing.
Note: This does not mean the hetero male is gay, or bi, he may very well be straight, except for this one incident, or, this may be the road down a very queer path.
Guy1: Dude, have you seen Kos? Hes dating a fuckin dude man!
Guy2: Ah shit, I've seen this happen before, it's the Pneumarian Effect!
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