I know of someone who at oysters up in a Paris end of Collins Street. They made her very very very very sick. Consequences, ongoing. Put me off oysters. My dad loved oysters so we all ate them. Sometimes, I'd bring them home after buying them at lunch time for him. He was always very generous in his thanks and expressions of surprise and delight, so we loved giving him gifts.
I tend not to eat them after the lady from the top-end restaurant at top end hotel got very sick indeed.