Mediaite Presents: 20 Killer Costumes — A Halloween 2009 Retrospective
16. Dayman!

Fans of It’s Always Sunny In Philadelphia – as we are – will appreciate the attention to detail that went into this Charlie Day costume. If you don’t know what we’re talking about, educate yourself here.
Via Glenn Howerton’s Twitter feed (he plays Dennis on Always Sunny).
17. Greenman!

Charlie Day’s other alter-ego on ISIP (again, educate yourself here). This pic comes to you via NIck McGlynn.
17 1/2. Nightman!

Sorry, but we just had to complete the circle: FameGame’s Ryan Brown does his best stagefreeze. Photo by Mo Pitz from Gawker’s Vice Party coverage. p.s. Again, if you’re not sure, educate yourself here.
18. The McPoyles

More Always Sunny characters — this time the creepy McPoyle brothers. Extra points for getting the weird mute sister in there.