If it’s over the phone, try beating your leg if you feel you are going to stutter the next word. It helps. Also, imagine whoever you will be speaking with, is sitting on a toilet, it might also help. Edit: Not till it hurts but a tap with a fist with the flat side of where your little finger is, if that makes any sense. Or just slap your thigh with your palm but they could hear that, so I wouldn’t do that. Also, you could try changing your tone slightly, it could work, too.