Peeing oneself is always funny when you're not the one doing the peeing! She has to realize that by now.

He just figures they could use a little more privacy. She seems like she's in the mood for a serious talk. That requires privacy and probably some whiskey for him. Both can be had in the car. No, they don't' get much sleep and Dean has always hated waking Sam up if he didn't have to. Yeah, Mon-El is an asswipe. He can do Kara's job for a while.

He hates that she's upset. One of these days it won't upset her. He knows that from experience. Dean might be shit at relationships, but he's been in a couple before. They've all turned out horrible, but that doesn't change that he can sympathize with her. He gets in the driver's side of the car and pulls one leg up, turning to look at her. The Impala has a bench seat that's good for lots of things. Late night talks are one of them. "Keep making promises, Sweetheart. One of these days I'm gonna call you on it," he teases her.

Dean is quiet for a moment, watching Kara. "Okay, Darling. What's all this about empty wombs and dying alone? Yeah, I can say it. You can't."

Which makes total sense as Dean doesn't have a womb.