Best one ever was many years ago.
I had a friend from university who came from a very wealthy Jewish family in Calgary. As it happens he marries a young lady who is the daughter of an even wealthier family. As a side note, the wedding was the most extravegant, posh event I have ever been to.
While she is very nice, she is certainly one of those very refined young ladies who as my granny used to say "Wouldn't say shit if she had a mouthful of it."
A few years later a bunch of us get together at their home for a BBQ during a conference held in Vancouver where they now live. Late in the evening we're all out by the pool, telling stories, drinking, laughing having a great time. Another friend tells a very funny story and we're all laughing and she is laughing so hard she lets out this huge, loud fart. Which make us all laugh harder. Well, the poor thing suddenly turns beat red, gets up and runs into the house. We never saw her again that evening.
I felt bad for her but it was perfect that it was her.