Oh my gosh, you're into some of my favorite fandoms. It's so hard to choose just one (or just one crossover even). :(

But I think I'll go wiiiith... Shunsui and/or Jyuushirou running into Ginko. Did the shinigami think a mushi was a hollow (it wouldn't feel the same of course but maybe it looked similar and thus was confusing)? Does Shunsui have a thing for even-tempered guys with white hair? Can Ginko see other supernatural things? YOU TELL ME!