There's a story told about Feynman in a non-scientific book (whether written by him or another, I don't recall) that I'm trying to track down.
If I recall correctly: he's part of a group (perhaps while still a student) that's trying to think of an explanation for some phenomenon. He offers one - perhaps based in physics - and is praised for it. He then offers a completely different one, and claims that the exercise is nonsensical: he can always fit a theory to such limited data.
Does anyone have a reference for (or correction to!) this?