1. Grubby but adorable nieces and nephew
    What, am I *not* going to play Team Umi Zumi with them just because their noses are all leaking snot?
  2. Too much time spent breathing in disgusting recycled airplane air
  3. Overworked parents not-so-secretly fighting off colds who want to give you hugs and kisses anyway because "you're never heeeeere!"
    So. Many. Hugs.
  4. Immune system comparable to Little Women's Beth