Sushi is a scary thing. In my opinion there needs to be a level of trust with the restaurant more so than most other foods.
I dropped in for lunch on Saturday, mostly because Sushi Time across the street was full, and sat at a table for two by the sushi bar. After ordering sashimi, I heard coughing and looked up - no, I thought the chef couldn't be coughing on the sushi, and went back to my book. Yet again I heard coughing only to look up and see him looking down and coughing (no mouth covering) onto my lunch. I said to him "are you actually coughing on my lunch?". He responded "you're not happy?".
No, i wasn't. I left five dollars to cover my diet coke and vowed to never return.