Ronald Giddings

Levity during a presentation helps to bring the stress level down for the speaker and the audience.Keep it light.It will help you feel a little more relaxed.

Michelle Lawrence

That is a great idea. Difficult though if you have a group of stone faced serious people in front of you.

Patricia Carter

I think laughing during a presentation helps me to get over being nerves

LaJuana McKay

True but this can also be dangerous if you aren't very careful about the type of humor you use. :)
Unfortunately, as a Toastmaster, I have heard some people use degrading terms in jokes that have really backfired.