The worst experience I ever had was going to a final exam.
Like an earlier poster, I went to George Mason University (back before it was popular!) I had one final exam left. The school didn't tell anyone that the Trans-Siberian Orchestra (TSO) was playing at the Patriot Center the same night as the last night of final exams.
For those who aren't local, the Patriot Center is the basketball arena for GMU...I left for my 7:20pm exam at 5:30 because I wanted to get there early, grab a snack, maybe meet with a friend for a quick review.
Normally the traffic takes about ~30 minutes to get there, so I would arrive at 6pm, giving me almost an hour and a half to do everything mentioned earlier. Instead, because of the piss-poor traffic management, I got onto Braddock Road about four miles from the school, and sat there.
Ok, no big problem, I've got an hour and change, and I can wait.
It took me almost three hours to get to class. I get there after running from my car. Only like 3 people are in class. Everyone else was still sitting in traffic!
Needless to say, the professor let us take as long as we wanted, or even come take it the following day. It sucked ass, and I'm really glad I didn't have to pee!