Allow me to tell you the story of when I pretend-grappled with a girl who didn't know anything about grappling. She was standing on a chair (I forget why) and we were drinking at a party and I hugged her legs pretending to take her down but not really doing anything. So, being drunk, she took this opportunity to playfully guillotine choke me like it's the most friendly thing to do, which is of course the only choke she knows, being untrained. It was not a blood choke but my trachea was subjected to INTENSE pain. Conveniently she neglected to stop choking me after I tapped very quickly. She held on 5 seconds after I tapped out, causing me to gag and throw up a little. She says later "Sorry I'm not trained in your sports so I'm not sensitized to that tapping out thing, I forgot what it means!".
My throat hurt for THREE WEEKS!