I've had it the other way around, not even on purpose. As the designated nooby sound engineer for the evening I had to mix the bands monitoring as well as the live mix for the audience. During the sound check one of the band members wanted their vocals to have a bit more "pop" in the mix, and not knowing what that exactly meant I asked them what they wanted. I don't really remember what it was they said, but it was something about boosting certain frequencies. Now, I have never had to do this before, and while I in principle knew how to do it the request kind of took me out of the flow so in the moment I completely forgot. So while this musician was looping his vocals so I could make the change, I was just selecting random menus on the console hoping I would end up at the right one. And, at some point, the guy was like, "oh yeah that's perfect!"

I had not changed any EQ at all. I wasn't even close to the right buttons, so to speak. But he still liked it, so I shut up and let them do their thing. Honestly I think it might've been his on inflection into the mic that made him change his mind, not the actual EQ, but whatever, he was happy with the mix and I was happy that I did not look like a total noob (even tho I was)