This is going to be good if there are enough former CPs and ICPs on here. I have so many so I will stick to the ones specifically from my CP. I don't think I would call them war stories because I always keep my cool and I love knowing that I'm right even when the guest thinks they are right but they are definitely good angry guest stories.
My CP was in 2012 before we had FP+ at HM. I was working the Guest Assistance line near the ghost horse hurst. It was around spring break and the lines were long. We had full canopy. A woman had stepped out of line to go to the bathroom. When she returned, she asked if she could wait near me for her family to catch up so she didn't have to climb over all the chains in search of them. Personally, I hate when people climb over the chains because I've seen my fair share of injuries resulting from it. So I said that was fine. There seemed to be many GACs coming through while the woman was observing and waiting for her family so she quickly learned the process and the reasons why these families where accessing the line at this point. I stopped a family to allow a GAC family to enter the line and a man in the party says "Why doesn't my kid get to cut everyone. what makes them so special?". This angered me but I kept my cool and took a deep breath. As I was about to explain the GAC card, the woman who had been watching steps in front of me, gets in his face and shouts "These families have been through more than you can imagine. Some of these kids have physical or mental disabilities. Its none of your business what the reason is but you need to think before you speak and be thankful for the life you have!" The guy didn't say a word and I just went about my business. I love that woman.
Of course we always get the "you ruined my vacation"...
Everyone also gets the "OK (insert name), from University of Blank (Or none CPs get their hometown), I'll be going to the manager!" ... yeah, ok good for you. I'm right and you're just mad you're not.
I'll add some others as more people get to posting their stories