anecdotal evidence
Your uncle is not a study.
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Wrong: “My cousin got rich on it, so it works.”
Right: “What happened to everyone else who tried?”
You’re hearing from the survivor. The rest didn’t get a story told about them.
Stories are memorable and statistics aren’t, so a single anecdote will outweigh a large study in most people’s heads. That’s a fact about attention, not about evidence.
The legitimate version: an anecdote is a fine reason to investigate something. One person reporting a side effect is how investigations start. It’s just not how they finish.
Now go find the study.