I think HP is the start of fandom; you get into it and next thing you know you're in several other fandoms. Everyone loves HP; haters are instantly jumped if they make a derogatory comment about the books or movies.
"Like a fairy!" Sherlock fandom has truly gone mad from the waiting. <-- In our defense, that line was kind of asking for it. Now that I'm looking at it, I'm actually surprised this picture didn't happen long ago.
Forget Waldo, Where's Your Fandom?-- I found IronMan, Thor, Loki, Darth Vader, Sherlock and Watson, TARDIS, Rory Amy River Jack 11, Professor X, Sam Dean & Castiel, and Patrick Jane being chased by Lisbon.