Last night we saw some pre-Halloween revelers out on the town in "costume," which seemed to consist of the usual terrible wardrobe choice of sagging-pants-reveal-entire-underwear and a fake Hitler-esque mustache, shared among buddies. We'd be a lot more impressed if you chumps showed a little commitment and grew actual, own-hair Hitler mustaches.
Here is how you do it, by the way, without looking like a trashy bigot to your friends and neighbors in the week or so leading up to fright night: grow a whole, normal, non-genocidal mustache, and then (this is the clever part) just shave off the end pieces when you're ready to go!