Impromptu Speech Quotes

I'm a high school teacher who is teaching Speech for the first time. Does anyone have good quotations that could be used for impromptu speaking? Nothing too obscure or difficult. These kids haven't taken speech before.

Thanks!

I would suggest looking at these

http://www.presentationmagazine.com/quotations.htm

I'm a high school speech team member specializing in Impromptu speaking. Some common and easy prompts often stem from common movies. At one of my easiest tournaments all the prompts came from Disney movies like Cinderella's "A dream is a wish your heart makes".

My belief is that if you give some one a qoute their speech will have a better chance at becoming something. One tragedy I see a lot of novice speakers make when recieving a one word prompt is that they talk about the word itself (and often run out of things to say or get run completely off topic) rather than its symbolism.