Apparently, according to Sears Department Stores, I look like this:
There are quite a few options on Amazon, including this one here, but you really need to get the "crazy eyes" down to make it look authentic:
If you spend $50 apparently you can get the sexy version of "Goin' Out of My Mind":
Oppressive, and stigmatizing costumes abound at Halloween. Please choose your costumes wisely.
P.S. Good news from the UK, "mental patient" costumes were taken out of stores recently!