I swallowed a 10 pence coin when i was 9, it was damn scary, couldn't breath for several minutes until my dad did the heimlich maneuver. However instead of pushing the coin up it went further down into my throat , luckily this allowed me to breath slightly. I went to the hospital and would have needed a operation to get the thing out of me, but later, before the operation i threw up, and out came the coin I still have the very coin with me today.