I was talking to some friends over the weekend, and one of them made a comment about gagging. He said that he read or watched that clenching your thumb with your other fingers (making a tight fist with your thumb in the middle) stops your gag reflex. So, naturally, as a bunch of stupid teenagers, all 7 of us proceed to do this while shoving our fingers down our throats as far as possible. None of us had a gag reflex.
Why does this work? it seems totally random and weird.