We had an absolutely crazy storm about 8 years ago. It only took about 10 minutes to pass over, but I have never seen rain and lightning like it and doubt I ever will.
At it's height there were two or three lightning flashes PER SECOND (absolutely no exaggeration). The sky was literally like a strobe-light and I was actually getting pretty scared watching it.
EDIT: haha, now that I've actually
watched the videos instead of jumping straight to internet warrior one-upmanship - yeah, it was like that one