Costumes that start with the letter "A"?

Apple. :P

be an a-hole

Damn it. I was going to say (Holiday) Armadillo.

Astronaut?
Adam (and Eve)?
Alien?
Al Capone?
Alicia? Cop-out answer. But potentially funny.

Any phobia beginning with the letter A.

Alphabet (or Alphabet Soup)- put cutout letters all over yourself.

Autumn – use some colorful fall silk leaves from the craft store

Austin Powers?
Who couldn’t resist being the international man of mystery ? :)

Alice in Wonderland
Alligator
Angel
Alvin (the chipmunk)

Alley-Oop

Angler
Ace of Hearts
Artistic License
Angelina Jolie

Dress as an aardvark and you’ll be the coolest person alive.

Australian
Aston Martin Salesperson
Active Bacteria found in healthy yoghurt drinks
Alice Cooper (yeah, welcome them to your nightmare)
Archie Bunker (make the meatball comments)
Artsie Fartsie Guy
Albert Lee (bring a telecaster)
Acne Man (if you’re young all you have to get is a cape)
Aaron Carter (you found out, i’ve got a crush on you)

alice in wonderland
alice cooper
alaska (for sarah palin’s sake)
art piece
anchovy

@iwamoto yeah, a lot of thought went into that one!

ah, took me just a few minutes, my brain is like an active vulcano…

@iwamoto creativity is beautiful art.

again, back to A words, uh, art… :)

Adam Sandler (do the mister deeds thing with a black foot)
Angus Young (you know, schoolboy uniform and gibson SG)
Amy Whinehouse (be sure to look extra skanky)
Alex Trebek (he’s the dude from jeopardy right ? make sure to do something with that)
Anarchist Kid (decide if you want an actual mohawk)
Alpha (you remember him right ? the little robot from The Mighty Morphin PowerRangers)
Axl Rose (old or new ? it’s up to you, if old, take a kilt)

Anthropologist?
Awkward?
Augustus Cesar (can you say toga?)
Angry Mob (I see multiple Halloween masks)

Aviator

How about something with a scarlet letter?

artist (but there will be several of those)
Aquaman
amoeba
Ajax can

Agoraphobic. Just put a fake house over your head.

“April showers bring May flowers”