Last election (2008) primaries, I had gone in to vote. They had 2 different lines - one for the Republican primaries; the other for the Democrat primaries. There was a sign for each, showing which way to go...
A woman was behind me; when she found out that she was in the line for the Republican primaries, she was morally offended, and pretty much let the guy know about it. The poor poll-worker could only tell her so much & was flummoxed. I finally turned about & told her very clearly and pointed out which line she should be in.
(not anti-Democrat; this story would have been just as funny if the lines were the other way)