Sam and Dean are working a case which requires them to wear suits. Dean searches his pockets to find the badge before they go in. "Oh crap, this is Cas'" "why do you have his badge?" "This must be his jacket. That means he's got mine" "how has that happened?" "I just picked up the closest piece of clothing that was on my floor". Sam is low-key internally freaking out and high-key laughing his ass off watching Dean's face once he realises his mistake.
I love that idea! I can really imagine how that would ply out on-screen, too! Sam and Dean’s expressions would be priceless 😂