There are several, some more public like a person laughing so uncontrollably that he almost fell in front of a crowd of people. But the most distinct/weird one i have in mind, which thankfully didn't happen in front of people, was at a doctor's office. Nurse took me in to a side room beforehand for all the prelim checks like BP etc and asked me to confirm my name. She didn't know I stuttered. I got stuck and started making my usual weird face; jaw locked, eyes getting closed etc. She thought i was having a stroke; quickly jumped from her table, started checking my pulse and called out loud for help. I had to calm her down. It wasn't public thankfully but I always get embarrassed and cringe at that memory just coz of how unexpected it was.