Flying last week I heard something I’ve never heard before. Fort Worth Center was holding for DFW airport, airport was not taking arrivals. I could sense the controller was getting pretty stressed and of course he was getting question after question as to why they were holding. Controller then went off and said, “we’re just holding for sh_ts and giggles”. There was a little more to the conversation but the guy was pissed. Next call was a different controller. I was surprised there wasn’t the typical 20 smart responses by pilots but there was dead silence after the remark by the controller.