I use an ice breaker/disclosure statement: "Hi" (this is mu bumper word) "and Good Morning, my name is Pedro Pena and I'll be your trainer for today. I do have a stutter so if I block on any word, give me 8 hours and hopefully it will come out" (this is where the audience laughs so they now know and their anxiety level lowers) "so if I get stuck, help out Pedro because I believe that Team Work Makes The Dream Work". I get it out at the start and then I can begin my 4 hour PowerPoint presentation.