I was once in a restaurant with my (then) boss and a few colleagues and I was, admittedly, extraordinarily drunk. Feeling adventurous, I ordered the oysters, as the boss was paying. When they came, they were beautifully presented in their shells on a bed of what I thought was rice. I discovered, after one very large mouthful, it was actually rock salt. Fortunately, everyone else was extraordinarily drunk and didn't notice me desperately trying to empty my mouth into my napkin. (it was Melbourne Cup day - the race that stops Australia... and gets them very, very pissed)