The Wi-Fi router misfunctioning right when you hopped into bed with snacks ready to watch a movie.
You turn the TV off and on again ("Have you tried turning it off and back on again?" -the IT help desk's favourite fixup) but still, the Netflix won't load. You try a different app, no dice. Grab your phone, check the connection, no Wi-Fi there either. Eventually, you just have to get up and head to the wall to reset the router, and by then you don't feel like watching a movie and it's all been for nothing. Cancel Wi-Fi routers misfunctioning.
Kids asking you to stop what you're doing and come outside to see the thing they've been working on, and then when you do, the thing" is jumping over a stick or something. If you're going to make me leave the potato peeling and head to the backyard, it better at least be a cartwheel or better yet, a flip of some sort. Cancel kids asking us to watch their tiny achievement
When you go to the fridge to eat the leftovers you had tucked away, only to discover the leftovers are not left over at all. They are consumed. By someone else, and you have to lower your standards and settle for two gherkins and the last of the bag of grated cheese. Cancel leftover theft.
There are plenty of things to get angry about, let's all just try to get angry in the right direction!