20 Things You Didn't Know About The 40-Year-Old Virgin

14. The "You Know How I Know You're Gay" Scene Was Improvised By Paul Rudd & Seth Rogen

The 40-Year-Old Virgin Steve Carell
Universal Pictures

Of all the movie's hilarious and unforgettable banter, the ridiculous "You know how I know you're gay?" conversation between David and Cal (Seth Rogen) might be the most memorable of all.

Believe it or not, the whole exchange was improvised by Paul Rudd and Seth Rogen on the day of shooting, proving beyond any doubt just how well-honed their comic chops truly are.

When the pair reunited for Apatow's Knocked Up two years later, they took another pass at the gag, though this time it sadly ended up on the cutting room floor despite their impressive penchant for improv.

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Stay at home dad who spends as much time teaching his kids the merits of Martin Scorsese as possible (against the missus' wishes). General video game, TV and film nut. Occasional sports fan. Full time loon.