That is funny. Maybe your son thought you were spending too much time on your laptop and it was taking you away from him. He got his revenge.
Or he thought since you're enjoying your "toy" so much, he'll enjoy in the fun and share the laptop with you ..... his way.
Hopefully you taught him that your laptop is off limits to him. Set some boundaries, otherwise if he thinks he can get attention this way and get away with it, he'll be testing different boundaries next time in the same way.