horrible presentation

went to give a pretty good presentation on carnitine tonight. plenty of new research, and very well put together. first the original room can not be used because the projector's bulb is burnt out (aren't there already enough burnouts in college), then over a half an hour later, i am moved to another room. 20 minutes after i am scheduled to be done, and class is to be let out, the presenter in front of me kills the computer, and i am forced to go without presentation to a crowd who wishes to be gone over 20 minutes ago. what do you say,"don't kill the messenger." i don't think that would have helped. someone needs to use this in the labs. at least it wouldn't have killed my presentation. you live and you learn i guess.