On last night’s Parks and Recreation, Leslie and Ron finally ended their feud — but it wasn’t easy. It took an overnight lock-in in their old offices to finally get to the root of their estrangement, and while Leslie was eager to get everything out in the open, Ron was … predictably less so. So Leslie brought out the big guns: her personalized version of “We Didn’t Start the Fire.†It’s awful and amazing, irritating but brilliant, and should be canonized in karaoke books across this land.