I caught a VP of one of my former employers surfing tumblr for pics of women that flash their tits in public and ONLY that. He was very consistent when looking for these pics. I got wind of it when I was given access to our Solera Deep See box right after being brought in. I monitored his activity for a week then checked his past activity and, sure enough, big tits flashed in public. Used a tool to capture his IE history: Big tits flashed in public.
I've seen execs that liked to search for wierd stuff, and they're all usually very specific on what they surf for.