Really?

As I was eating lunch with my husband and his co-workers (an upside to not having to work today), I received a call from the school that forgot to call me this morning to tell me that my job was cancelled. They had a teacher get sick and wanted to know if I could come in. I told them I was eating lunch and asked how soon they would need me there. Her response was..."Right now, but thank you anyways. We'll try you again on another day." So now, I'm even more irritated. I know I sound really gripey...and I probably am. But I started out this morning in an excellent mood, only to have my day completely scratched. Thanks!