Define "crazy"

Gallaudet University has its share of wackos.

One day I was getting in the elevator when the RA of the dorm (a nice hearing guy) started acting silly and calling out to me in German from the lobby. As the elevator doors were closing I signed to him that he was "crazy".

I didn't notice as I was coming in that there was another guy in the elevator with me.

"What does that sign mean?" he asked, referring to crazy.

"Oh, you know," I said, and started gesturing different forms of crazy to demonstrate what it meant.

"Oh," he said. He scowled and then leaned in towards me dangerously: "Are you calling me crazy?!?"

Holy shit, I thought.