Rainman, Dean? The small reference very clearly goes over Mary's head as evidenced by her brow arching; the gist behind it not so much to stop her chuckle. "Explain that one to me." She rests her chin into her palm.

She remembers how she said to John that a van would be the safest option. "I'm glad that you didn't let that happen," she admits. Today, she knows a van would have been a mistake.

"No" she shakes her head to agree. The only difference Mary sees sometimes is that Dean is able to use more words to express himself, but his actions still remain his primary form of expression.

"A protein shake?" The suggestion itself isn't shocking, but the conspiratorial tone makes it sound as if they've become partners in crime. Mary is on board. "You know you can't make your dad do anything he doesn't want to, but tell me your idea."