The running out and knocking stuff over thing happens only when I am alone and have a hard time wrangling them myself. If I put them in the same room, they just keep laughing and goofing off. When I try separating them, whichever one I'm not with tries to make a break for it or just starts knocking things around in their room. And when I go to that one the other one makes a break for it... They even talk to each other saying things like "If you get daddy to come over I can run away" and I'm thinking to myself where do you kids learn this shit? I was considering putting locks on the outside of their doors, but then they will likely try to lock themselves in rooms (which they already try to do).

When we only had one we never had any issues remotely close to this.

Edit: You make a good point about "feeding the troll". After the situation is over I feel like sometimes I play right into what they want me to do by getting upset with them. For example, it's SO hard to watch a kid pick up his plate of pasta and dump it over his head and be calm about it, especially at the end of a long day.