A Synchro
When two people say the same thing at the same time. It’s like they’re trying to jinx each other but it just makes them look dumb.
'We both said 'What the hell?' at the same time. That’s a synchro!'
'He said 'That’s the worst movie ever!' and I said it too. Jinx!'
'We both yelled 'I quit!' at the same time. That’s a synchro.'