The Hormones.

     Me: Honey, are you crying?
   Her: (with a slight tremble in her voice)...I don't know...
     Me: Is that a yes?
   Her: (this time, she's straight-up sobbing) YEEEEEEEEEEEEEEEEEEEES!!!!!!
     Narrator as the voice in my head: Really? We were just talking about walking the dog....

     Fastforward to later in the day: Scene is my parents condo, my mom is on the phone to my sister who is understandably upset and crying because she's taking the crib apart for the last time because her youngest no longer needs it and he's her last child.
     Mom: You should hear your sister, she's got so many memories around that crib...
   Me: That's nothing, you should have heard Catie this morning. We were talking about walking the....Catie? Are you crying again?
     Her: (with the same tremble in her voice) .....No?

   As the tears began to fall, the entire room is filled with an awkward waiting. She cracks a smile, then everyone bursts into laughter. Catie's the only one crying while she's laughing, but that's pregnancy.