Big Day: October 8, 2009

Why it's memorable: Six season in the making, the wedding of Jim Halpert (John Krasisnski) and Pam Beesley (Jenna Fischer) tugged heartstrings as only a long-running TV romance can. But Jim and Pam's

coworkers stole the show when they danced down the aisle (without the couple's permission) in tribute to a certain YouTube video.

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