When I speak, I don't like to waste any time - mostly because I believe in the importance of what I am saying. Every second I spend not dealing with the topic and my own take on it is a second I spend wasting the listeners' time - and I don't have the right to waste anyone else's time.
Introductions, jokes, sappy analogies, visual aids, long quotes, even scriptures - all of these things are not important when compared to the insights I can offer. My own life is far more important and interesting and enlightening than these other things that make me a spiritual time thief if I let them take precious moments from my allotted time.
This is true especially if Sunday falls on April Fool's Day. *GRIN* I hope I gotcha with this one!