Pissed off!!
I HATE it when people flake on me out of nowhere, without apologizing. I was going to go get dinner with a friend and then study with her for finals, and then she texted me an hour in advance and went "I'm really full -- can I meet you to study, after you eat?"
I was like this "

... why did you eat?" and she went "I tried to go to this sandwich place and the line was too long, then I tried this other one, and the line was too long..."
and I went "

No really... why did you eat???" and she said "I realized that it was the last time this sandwich place would be half off on Monday, before we leave after finals week!"
She didn't even apologize, she didn't acknowledge that she was bailing on plans with me. She didn't think of anyone but herself, that entire time! Maybe if she were a Perceiver I'd cut her some more slack, but firstly, courtesy doesn't relate to type, and secondly, she's a freaking ISFJ.
ARGH! I don't understand how people think that's okay!!!!