A couple examples come to mind. One time, in an english presentation in high school, I simply couldn't speak. Full block stutter. Standing there, eyes bulging for a good 30 seconds before my partner took over. He then said all of my lines. At my previous job at party city, we had to call out names for when people's balloon orders were done. Unsurprisingly, also a block stutter. I just stared at the person in the eyes until he came over and took them, then I stumbled over saying "Have a great day." Still remember the feeling of my managers judging me.