Here are some ideas to get you started and creating an introduction for your speech

Stories (Readers Digest, Guideposts, and YouTube)
Quotes (Bartleby)
Movies (IMDB or Amazon)
Books (Amazon)
News (Alltop, Digg, or ????)
Personal Experience
Pop Culture References (TV shows, music lyrics, etc)
History
Literature (including legends, myths, and allegories)

(see also: Writing a Research Paper @ Purdue University Writing Center)