For instance, I was not aware that "Wordless Wednesday" is some big carnival blogging thing. I ran across it on another blog I check out occassionally, and thought it was a neat idea. Turns out that there are hundreds (maybe thousands) of blogs that do it, and they link to a main site somewhere.
I'll probably keep up the concept, but not join the carnival... the tilt-a-whirl always makes me sick to my stomach anyway.