Should I be worried about my laptop playing a video while closed?

If you didn’t touch your laptop at all and it just started playing, it might still just be a fluke. You mentioned scanning it with Kaspersky, and if nothing came up, that’s a positive sign! Just keep an eye on it, and consider checking your laptop's privacy settings if you’re still worried.

It's unlikely that a hacker is on your laptop. Sometimes, your mouse can get bumped, which prevents it from going into sleep mode, leading to unexpected behavior like videos playing. But if you're concerned, running a scan with tools like Malwarebytes is a good idea.