Two bad experiences...
First Subway in Queenstown NZ. Got offered extra ham for free ended up in Hospital and missed most of my rugby tour.
The 2nd and by far the worst. I was playing Rugby in Dublin, Ireland. I was taken to one of the top restaurants in Dublin. I had Dublin Bay Prawns. Ended up in hospital after days of sickness. Lost 12kG and lost my Rugby contract. Thankfully Dublin Heath got involved and prosecuted the restaurant.