In college, there's nothing worse than getting up early, traversing the freezing cold campus, and arriving at class to find a note taped to the door saying that class was canceled. I could have been sleeping for two more hours, but instead, I had to haul myself to the library because I didn't want to make the treacherous journey back to my warm bed.
One thing that could be worse than an inconvenient cancellation: an inconvenient uncancelation. Don't you hate when a mandatory thing gets canceled, only for it to be uncanceled, totally robbing the joy of not having to go to an event that you didn't want to go to in the first place? That usually doesn't happen: canceled events tend to stay canceled. However, one college student recently had the mildly infuriating experience of their professor emailing the class the night before that class was on for the next day.