I've heard it as an anecdote many times, never heard of it actually happening.
There were a few times I've had people tell me that same story as though it was them, and I've questioned, "Was that ACTUALLY you doing that? Who was the professor? What was the class? When?" and invariably they back down a bit, "Well, I heard it this one time."
For convenience, I'll assume this "I was in a class" was really 'I heard a story about a class", rather than questioning your unassailable online integrity.
It honestly actually happened to me personally. But it is more interesting because regardless of whether the story is true, someone hearing the story can still learn the same thing as if they had participated for real.
All information is fiction, but individual pieces of fiction can be grouped together into self-consistent clusters. When reading a story, everything within that story can be self-consistent, and therefore true within that story, while at the same time being false when compared to the real world.
Yet it is possible to migrate information from isolated fictional clusters of information into your "trusted" fiction (your beliefs). The trick is determining what you should migrate and what you shouldn't.