I have strange thing in my logs recently. Hundreds of visits from different IPs, with exactly the same User Agent headers and six different Referers. The addresses (or headers) are obviously spoofed, the Referer link is referer spam (from sites in .tf and .nr domains).
The interesting thing is, however, what they link to. To only one post -- the one I made in August about referer spam. What's even more interesting, I have found such links on at least one more site (which has no anti-referer protection), also in text about referer spam.