I'm going to break my own laptop that my brother hid under a pile of pillows
Why would you break your own laptop to get back at your brother?
He hid my laptop, I'd like to make him regret doing that
Your brother should not be hiding your things because it is disrespectful and causes drama.  Instead of breaking your own laptop, try asking your brother why he hid it from you and he should apologize if he has respect for you.
Yeah this sounds like a terrible idea
It could go so wrong. If he is broke he wont be able to afford to replace it. You could also get hurt or start a fire.