Strange experience with it myself. I was at a family gathering, a couple of years ago. And my cousin's son acting up, not really misbehaving I think (he was also quite young then, I should point out). And my cousin warned him, if he didn't stop, he'd have another "time out". Do those really work. And perhaps explain them a little. I know, my cousin is a high-priced corporate lawyer. We joke he's the rich one in the family. But he and his wife are very nice. And I'm sure their kids are well-behaved. So do they work?
Kids thrive to please you! Simply sitting down and telling them you are disappointed and then what they did wrong and should have done will go a long way. If it was deliberate then continue to ask why they did it until they admit to the real problem. I garentee it has nothing to do with what they did wrong.