1. Brad Pitt had a haircut that even Brad Pitt could make work

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2. Nathan Fillion went to prom looking like Pee-Wee Herman

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3. Jeremy Renner had a haircut that was even riskier choice than The Bourne Legacy

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4. Seth Rogen had dreadlocks AND was super into Korn. Never let this go.

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5. Tina Fey might have been underselling how nerdy her teenage years were

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6. George Clooney's ridiculous swinging lifestyle only makes sense when you realize THIS is what he used to look like

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7. Chris Evans, looking doofy in a photo that marks the last possible moment I could have definitely beat him up

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8. Mark Ruffalo looks as inoffensive as reading his twitter account FEELS

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9. Peter Dinklage rocked a mullet more epic than the entire Game of Thrones franchise

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10. Neil deGrasse Tyson was a REAL nerd back in the- OH JESUS COME ON.

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BONUS: Chris Pratt - now the most laid-back, chill movie star (who also happens to be insanely-jacked) - was the douchiest-looking guy around in his early days. At least he's aware of it and totally owns it.

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