I've got certain characteristic words that I over-use, as everybody unfortunate enough to know me has doubtless observed. While typing back and forth with a remote comrade recently I challenged her to tell me something to prove that it was really her at the other end of the "chat" --- and in turn, I suggested:
"And to prove who I am, would you like me to use 'disambiguate' in a sentence?"
She replied that the mere offer was more than enough to convince her!
(see also MetaTuringTests (20 Mar 2003), ... )