Disclaimer: No supernatural is sadly not mine. Don't sue, thank you.
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1. Never kill Uriel the angel just for being a dick
2. Never dress Dean in a clown suit to terrorize Sam
3. Never dress Sam up like a plane for Dean
4. Never tell John to die his hair, no matter how grey it is, he'll use the Colt
5. Never draw on the Impala
6. Never glue yourself to the ceiling while they sleep
7. NEVER try and seek up on any of them unless you have been trained by ninjas
8. Never make fun of Ruby's new body being man-ish
9. Never call Sam the Puppy-Dog-Eyed Anti-Christ
10. Never steal Dean's pie, he too will use the Colt
11. Never steal Sam's shoe, he can loose it without your help
12. Never say Bloody Mary in front of a mirror, Sam's eyes bled last time
13. Never call the cops during a hunt, lest they start to believe in real ghosts
14. Never put on any kind of oddly colored contact when around them
15. Never ask tell Sam he needs a hair cut
16. Never ask Dean why the only girl he dated looks like a Wendigo
17. Never burn down their old house in Laurence and blame it on YED
18. Never ask why they killed the people from The Chainsaw Massacre
19. Never put anything in their mouths while their sleeping, no matter how tempting
20. Never tell Sam you killed Sarah
21. Never ask JW why he was barking at the end of Devil's Trap
22. Never smash the Impala into a tree and blame Sam
23. Never tell Sam you really did try the ash tray trick and it worked
24. Never use superglue when around them period
25. Never ask Andy if he is a Jedi
26. Never use that sulfur cologne you bought a while back
27. Never ask Lilith if she wants a teddy bear unless you want to see that glowing white light trick she does
28. Never give Dean any kind of drug, it'll bring up his addiction
29. Never key in the people from Intervention about Sam's powers
30. Never point out just how creepy it is that Dean had the hots for his mom
31. Never ask why no one we see ever wears anything but nightgowns or straight clothes to bed
32. Never try to shut down Busty Asian Beauties. Ever
33. Never start screaming and say that angels are talking
34. Never trick the boys into thinking you are a vampire
35. Never take them to Twilight. All they will do is bitch and moan that that's not how vamps really are. Sam might even comment on how it is nothing like the book.
36. Same goes for Hairy Potter
37. Never accuse Lilith of being a pedophile
38. Never try and remove their possession tattoos
39. Never pretend to be a doctor when one of them it hurt and ask them to take off their shirt
40. Never point out how good Dean would be in the movie industry
41. Or the musical industry
42. Or the Sports industry
43. Never claim Dean has a son
44. Never trick the boys into going to go hunt for dragons
45. Or unicorns
46. Or big foot
47. Never ask Sam if he wants to go sit on Santa's lap
48. Never film the boys and post it on Youtube
49. Never make fun of Dean for screaming like a girl in Yellow Fever
50. Never pretend you see a ghost, it never ends well
