In another sign of our times, the TSA in St. Louis recently detained a man who was carrying $4,700. What this has to do with public safety, I don't know. Last I heard, cash does not explode, nor do most people find it very threatening, although some of the portraits on the bills do leave me feeling a bit nauseated (particularly $5, $10 and $50 bills).
What makes this all the more interesting, however, was that the detainee was able to record much of his conversation with the TSA thugs. It's illuminating to say the least. Note the part where a TSA rep exclaimed "Are you from this planet?" when he asked them what law required him to answer their questions about where he got his money from.