I once had a co-worker who was more senior than me on our project (the business lead (I was software lead)) tell me that I was needed in a "very important meeti

I once had a co-worker who was more senior than me on our project (the business lead (I was software lead)) tell me that I was needed in a "very important meeting" during lunch the next day. Unfortunately, I had plans to meet with a friend for lunch - and that friend was moving away the following afternoon. When I told my coworker that I was not going to attend the meeting during that time under any circumstances he lost his shit ...and I calmly and sternly told him he can take it up with my boss. I walked away from that conversation thinking "well shit, it was fun while it lasted", Surprisingly my co-worker cooled down, dealt with the meeting situation, and never said a word to my boss. To boot, he _never_ lost his shit like that with me again and we've had a pretty good friendship ever since.