It seems as if funny or odd things must be genetic in our family. Either that or Abby is a fast learner and Megan gets way too much quality time with her.
Since she was very young, Megan has done this funny / odd thing where she's "chilly". She gets rigid and shakes on purpose. Get it? Chilly? Anyway, Abby's picked it up -- it's kind've funny. Megan is also trying to teach her various words and they're pretty good too.
Ah the benefits of older siblings.