Sometimes I find an outsider in a conversation with little or no knowledge about the subject or ground already covered in the conversation makes a random guess about a question no one can answer and it turns out to be correct. I have experienced this often enough that it seems like there might be a word or phrase for it, but if there is I don't remember it. Any insight would be appreciated!
Wow, Bert only said that it might be catalytic converter because he heard us say that term earlier in the conversation. He doesn't know anything about cars. I can't believe he was actually right! That was a real ________!