Fellow speaker,
Mentioning a reference to a well-known story, poem, music piece, or pop culture reference can instantly connect you to your audience. When referencing don't explain the reference...it should be well-known enough to the audience that it needs no explanation (e.g., "I was moving so slow yesterday I felt like a tortoise, but without the positive finish." referencing Aesop's fable "The Tortoise and the Hare").
Referencing,
Tim Wilson
Professional Speech Coach
Free speaking tips at: http://speakingquicktips.blogspot.com