I love the word "crazy". I especially love discovering what kind of odd associations people might have with the word/concept "crazy" [as in mad or insane].

Some of the best reactions I have gotten out of people, regarding pretty much anything, is when I, say have a nice long chat with someone about philosophy or culture or music. Ya know, something totally "normal"... and then a flippant comment is made about someone being crazy, and I often go something like:

"Totally, we crazy people are quite the handful"
-person laughs, until they see I am not really joking-
"Oh, by the way, I'm certifiable. For serious, I'm crazy. So, what were you saying about free will and personal responsibility and such?"

Either conversation continues genially on any number of subjects, or there is a lot of coughing and attempted back-pedaling.

Either way the person is often a bit taken aback, and it's an interesting experience.
...I should probably stop with the social experiments...