Breaking or interfering with, or interrupting any routine of mine, is a bad thing. I have a really tough time with it. I have slated a certain base template for my day's activities, and anything coming in the way of that, will cause the whole day to get SNAFU'd and put me in a tense mood. Even if I oversleep a half hour, that's enough of a dent in the schedule to cause me trouble. I eat the exact same breakfast 365 days/year (366 on leap years), and that's regardless of where I am, or what I'm doing. If I'm going to be someplace I can't have it, I plan around that and make sure I can have it.
Another example of disrupting my routine would be any and all of the zillion changes and updates to computer software and Windows, and the almost daily changes to forums and websites. I'm a functioning and somewhat successful businessman, so I have to tolerate those things and get past them, but it's an annoyance to have to do so!
I also don't like to change what I drive. I've had Toyota trucks since I started driving in 1984, and although I'm a car and truck hobbyist, my daily driver has always been a Toyota truck. I just bought a brand new one in July, and it's the same model number as my previous one (2005), and I'm even going to buy the same custom wheels and tires for it. Boring? Not to me! Now I just need to get the courage to sell the old one, and the other old one before that one, which are still sitting here costing upkeep. I have a problem parting with them, until I'm "sure the new one will do".
Charles