My favourite (and it seems universal) is when they do something they know is wrong/forbidden, say destroy something. You show them the thing asking 'whats this

My favourite (and it seems universal) is when they do something they know is wrong/forbidden, say destroy something. You show them the thing asking 'whats this?' 'did you do it?'. They just look to the side pretending that they are not paying attention to you. Like you are not there, until they break and just try to hide :D Its priceless.