Mental voice of rebellion

I have an appointment to go to a class about Hispanic culture at Hosei University on Monday afternoon. The professor has asked me to prepare a short talk in Spanish about myself. There is a small but persistent voice of rebellion in my head that wants to slip in something unexpected. Any ideas? It can't be anything too crazy, given that the professor will definitely understand whatever I say, but I'd like to have a little something that just a few of the students get which will have them thinking 'did he just say what I think he said?!'