The challenge word is coat. And this is a tag to Somewhere Between Heaven and Hell.
I wish I could keep these guys, and I'm probably going to end up wishing forever.
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"Seriously, Sammy," Dean said. "This is why you don't drive."
"Don't blame me," Sam pleaded, "blame that (bleep) hellhound. And besides, all it needs a few fix-ins, a coat of paint, and the Impala's like new."
Dean argued, "I don't know, I think I can recall every mistake like this."
(Begin flashback)
"This is why you don't shop. You just forget the pie."
"This is why you don't cook." The kitchen was filled with smoke.
"This is why you don't get a girlfriend." Sam was just rejected by a woman.
(End flashback)
Okay," Sam sighed in disgust. "I give up."