Browsing Snapsort (looking for the "ideal" camera for Veleta -- it's an interesting site with a nice browser/comparison UI) I clicked on a group of possible comparisons.
And waited for them to load. And waited.And waited. And waited. Then I noticed they had already loaded but the favicon (this sort of fading shutter thing) looks so like the "I'm loading" spinning rosette that Safari puts in the same location that my visual system had grouped the two together. Interesting bug.