Have you ever been having a pretty good day, getting work accomplished, feeling like things are going well, and then WHAM some crap hits you like a truck and destroys your good productive mood?

I got down to job 2 early this morning. The early train was actually on time and even a little ahead of schedule (if you can believe it). I sent some emails and made some copies for my meeting later day. Then I went and entered a bunch of grades in the computer lab. I got an email from the secretary that the food for the meeting had arrived, so I went to get it. We bring the food down to the computer lab and the computer tech guy is there and barks at us "what are you doing? what's going on?" I tell him that I have a meeting in there later today at 2pm and he grumbles that he had planned to work in there all day. I mentioned that I just needed to put a couple of things on the computers for the class and he gets really mean and yells "and just how are you going to do that? you don't have adminstrative authority. only I can put things on the computers, we don't want other people doing that." I try to be apologetic and say that I didn't know. And now I just feel like crying. It was really embarassing being yelled at in front of the secretary and the professor I'll be working with, and there was no reason the computer tech guy had to be so mean. And now I don't know what to do about the big file I need to put on the computers. I'm afraid that if I just wait until the computer guy's not around, he'll find it and come yell at me some more, but the students can't do the lab I planned without that file on the computer. And of course our meeting is scheduled to be in the lab and if the computer guy is in there I can't really talk about this file without him knowing and so on. Now I feel sick to my stomach and crushed and incompetent.