If you get flustered or upset by something that happens during your speech, pause, take a breath, and move to a different part of the stage. This will "reset" yourself so you can get focused back on your speech.
Moving,
Tim Wilson
Professional Speech Coach
Free speaking tips at: http://speakingquicktips.blogspot.com
Professional Speech Coach
Free speaking tips at: http://speakingquicktips.blogspot.com