A CD you own that you don't think anyone else on your friendslist does:
Cocktails in the Cantina, a CD of Star Wars inspired lounge music. o_O

A book you own that you don't think anyone else on your friendslist does:
G. K. Chesterton's The Man Who Was Thursday

A movie you own that you don't think anyone else on your friendslist does:
Ahem... Do the Lesbian Act 6, a Japanese... erm... art film... featuring two women wearing body paint to look like a pair of cats.

A place you've visited that you don't think anyone else on your friendslist has:
Tecate, CA and Tecate, Mexico. Most of the turistas cross from Alto California to Baja through San Ysidro, Otay Mesa or Calexico, they normally don't drive out into the middle of nowhere that is Tecate.

A piece of technology or any tool you own that you think no-one else on your friendslist has:
A Victorinox Swiss Champ XLT. It's not a Swiss Army knife, it's the entire freaking Swiss Army!