Had many but this one still keeps me up at nights. Just joined university and was talking to a "friend" in cafeteria. He knew about the stutter and everything. 1 question came up about the name of another university and I blocked for over a minute. I make weird faces while i block. The guy just bursted out laughing uncontrollably. He laughed for like 5 minutes straight with so much noise that other people in the cafeteria were noticing it. Almost fell down laughing. I still regret staying and not punching him in the face that day.