The admin pages for this blog have a “sparkle bar” along the top that shows the hourly hit rate, which is usually a simple diurnal cycle: most activity happens during the Western Hemisphere daylight hours.
Yesterday was different:
In the space of about 10 minutes, my sleepy post about a bicycle saddle advertisement received 207 hits from “bike riding” at Yahoo! image search. For the last two and a half years, it’s been ticking along at about 1 hit/day, so I think that spike represents a nice example of a Dirac Delta Function in action.
I no longer even pretend to know what’s going on…