Considering that I wrote “Mastering Regular Expressions”, a generally well received book about computer-science pattern-matching technology, I thought I was quite familiar with them, but I've recently become aware of a dark side I'd not known about.
Like any technology, they're not everyone's cup of tea, of course, but it seems that overexposure can cause severe..... something.... I'm not quite sure how to explain it, so as evidence I'll just present Yasuyuki Okamura's music video for his song “Buu shaka”.
(Note: the song probably makes more sense if you don't understand Japanese.)
Catchy tune, though.