Probably back in high school (10th grade). Had a presentation for my environmental science class. A few days prior my friends and I were just messing around and this random thing happened where we realized I don't stutter while I'm listening to music through sound isolating earphones. Kept testing it out, even when speaking in second languages (stutter is infinitely worse then) and nothing, no stutter. Truly amazed, I ask my teacher if I could present like this. She gets approval from the high school principal, the principal sits in on the class. I present with my earphones in busting some pac and em at the time. I don't think I've stuttered worse in a presentation in my life. I could barely get a word out, shaking voice, sweating like crazy. Most embarrassing moment as a stutterer I've had. But bah we got over that.