Crazy stamp

This is whenot you meet someone and right away you know they are out of their mind and you want to stamp the work crazy right across their forehead.

I just meat Erica...she totally gets the crazy stamp

crazy as aliens

Really crazy, in a loopy, delusional sense. May derive from the sense of 'as crazy as someone who believes in aliens' i.e. to the extent of wearing tinfoil hats, or, less likely, someone who thinks as differently from a normal person as someone from another planet would.

"Why is Donna pacing in circles mumbling to herself?" "I dunno, the girl is as crazy as aliens."