Machanist
When two people think they’re the only one who knows how to fix things, but they’re both wrong and don’t know it.
He thought he was the only one fixing the printer. I showed up with a tool and we both looked confused.
We both tried to fix the air conditioner. Now it’s not working and we’re both sweating.
They both thought they were the only one fixing the car. Now it’s broken and they’re both yelling.