Because I'm having such fun with this show (despite its propensity to make me flail and hide under the covers at regular intervals), and having watched a representative sample, I give you:
Generic Supernatural Episode: Season 1 Edition
OFFSCREEN MONSTER: Raaaar!
HAPLESS LOCAL: *perishes under suspicious circumstances*
MUSIC: Dun dun duunnnn!
SAM & DEAN: *roll into town, accompanied by Van Halen riffs*
DEAN: *swaggers* We are FBI Agents/Forest Rangers/Police Detectives! Really!
SAM: *passive body language* We just have a few extremely odd questions...
LOCAL OFFICIAL: Sure, whatever.
SAM: I went to college! I can do research! *goes records-diving*
DEAN: I am such a badass. *turns up jacket collar*
OFFSCREEN MONSTER: Raaaaar!
ANOTHER HAPLESS LOCAL: *dies under equally suspicious circumstances*
SAM & DEAN: *consult Journal O' Evilness*
LOCAL CUTIE: Hi! I have info on local mythology/past events/suspicious behavior on the part of various notable townsfolk that may prove useful!
DEAN: *winning smile* Do you, now?
OFFSCREEN MONSTER: Raaaaaaar!
DEAN: And now for something completely illegal! Today, we will be Breaking and Entering on State Property While Carrying an Unregistered Nickel-plated Sissy Pistol.
LOCAL OFFICIAL: Hey, you're not really FBI Agents/Forest Rangers/Police Detectives, are you?
SAM: What was your first clue?
OFFSCREEN MONSTER: *abducts local cutie*
DEAN & Sam: To the rescue! *dash into dark forest*
FOREST: *is very dark*
SAM: By the way, have some angst.
DEAN: What angst? Where?
SAM: Daddy issues!
DEAN: Defensive wisecracks!
OFFSCREEN MONSTER: Raaaar!
LOCAL CUTIE: Shrieeeek!
DEAN & SAM: *elaborate smackdown involving guns, fire and salt*
LOCAL CUTIE: You saved me! Smooches all 'round!
LOCAL OFFICIAL: Well, I s'pose you two are alright for fly-by-nights who impersonate government officials. *indulgent shoulder-pats* Off you go, then!
SAM: So, about that angst...
DEAN: Still don't know what you're talking about. *cranks AC/DC*
IMPALA: *sexy engine noises*
ROLL CREDITS