"Heat of the moment!" Sam slowly sits up in bed, murder in his eyes. DUN!
Diner. The camera focuses on the supremely suspicious middle-aged syrup-switcher for a lengthy period of time, while Sam bores holes in the guy's back with a hostile glare until the gentleman in question rises to leave. Sam quickly follows with a paper bag filled with death and destruction, and a befuddled Dean chases after the two; out on the sidewalk, Sam slams the guy up against a fence, pressing the business end of a blood-encrusted stake against the guy's neck. Sam babbles on about the guy's M.O. -- "going after pompous jerks" to "give them their just deserts" -- and the guy babbles back at him for a bit, pleading for his life and such until he finally abandons the charade and morphs into last season's still-alive Trickster, much to Our Intrepid Heroes' shock and dismay. Richard Speight smarms something about his unlikely survival until all three of them get gobbled up by the METAL TEETH CHOMP!
By the way, I've been avoiding spoilers this entire season, and so would not have had the faintest clue that twist was coming had it not been for the appearance of the actor's name in the opening credits scroll following the title card, so you might choose to keep that little detail in mind the next time you want to fake out the audience, Kripke. Just a suggestion.