Ross from Friends
Episode: "The One With The Halloween Party"
Why it's so great: Get it? Sputnik? Spudnik? Potato space station? It's so perfectly nerdy we could stop here. (But we won't.)
Tom Haverford from Parks and Recreation
Episode: "Greg Pikitis"
Why it's so great: It's Tom Haverford, the greatest wannabe baller on television dressed as his idol and doing a terrible, but zealous, impression. Perfection.
Troy from Community
Why it's so great: It's a toilet seat cover that says "Dracula." It's so lazy it comes back around to brilliant. Plus, Donald Glover shirtless is never bad.
Fez from That 70s Show
Episode: "Too Old To Trick or Treat, Too Young to Die"
Why it's so great: It's Fez in stockings and a pearl necklace completely misunderstanding the point of his character. Enough said.
Jim from The Office
Episode: "The Koi Pond"
Why it's so great: It's obstinate and sarcastic, it builds on his original lazy costume (three hole punch Jim), and he's so lovable he can get away with it.
Haley from Modern Family
Why it's so great: This is what Haley wears when her mother says her other costume is too slutty. This is insulting to the word conservative...and Mother Theresa...and charity -- which is also why it's so hilarious.
The Three Stooges
Uncle Jesse, Uncle Joey and Danny from Full House
Episode: "It's Not My Job"
Why it's so great: Honestly, it's just stupidly cute -- just like everything else on that show.
Barney from How I Met Your Mother
Episode: "Slutty Pumpkin"
Why it's so great: This is how I imagine Barney sees himself on a daily basis, so of course that who he dresses as for Halloween.
Chang from Community
Why it's so great: Jeff guesses Chang's costume, "Kristi Yamaguchi?" to which Chang responds, "Peggy Fleming. You're racist! Just been proven racist by the racist prover." So Chang. So perfect.
Michael and His Other Head
Michael Scott from The Office
Why it's great: Michael Scott with an extra paper mache head. Comedy gold.
Leonard, Sheldon, Howard and Raj from The Big Bang Theory
Episode: "The Middle Earth Paradigm"
Why it's great: Four nerds arguing over matching super hero costumes, plus Raj's idea that they could walk in a straight line so they look like the Flash moving really quickly is too solid to ignore.
Phantom of The Opera
Charlie from It's Always Sunny in Philadelphia
Episode: "Who Got Dee Pregnant?"
Why it's great: "He eats theater people!" "No, he doesn't." "I think he might."
President Obama on SNL
Episode: Season 33, Episode 4
Why it's great: I think that's pretty obvious.