anomaly images question server_logs thumbnails

I have to ask: how many of you, my readers, actually click on any of the thumbnails of images that I post?

I haven't been mentally keeping track of how long this has been going on, but in going through Leandra's Apache logs periodically I've been seeing entries like these (anonymized for reader's privacy):

a.b.c.d - - [13/Mar/2009:16:31:40 -0400] "GET /pictures/the_last_hope/tn_dcp_2077.jpg HTTP/1.1" 200 10813 "" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) Firefox/3.0.7"

...whenever someone pulls …