Background: I used to supervise our work study students. To alleviate some of my workload, my director removed that duty from me and gave it to Annoying Coworker. Every year, before finals start, we have a Christmas lunch to thank the work study students for their time.
Two weeks ago Annoying Coworker sent out an email listing the date and time of the lunch. It was scheduled for today. I had an appointment today (that I had scheduled weeks prior) that I could not cancel so I emailed her and said that I would not be able to attend.
Well, I returned from my appointment a few minutes ago and she stopped me at my desk and said the following:
"I think you were very rude not to attend the work study luncheon. It's like you're telling them you don't appreciate them."
What?! Thankfully, I did not JADE. I simply said nothing and stared at her for a few minutes before she stomped off to her own office. When she left I did this

.
I was sorely tempted to say "I didn't realize your invitation was a summons". I didn't; but I reallllllllly wanted to.
