I'll try to post these every other week day (Mon-Wed-Fri), but I make no guarantees. Sometimes there will be more than one cap for a beginning or ending of an episode. I'm also using my capper's discretion - meaning I'm choosing the most aesthetically pleasing image that we see first or last not always literally the first or last things we see. I'll explain this as we go along.
:: Click on images for the HQ versions ::
5.12 Beginning: The episode opens at a bar where we see Sam not acting like himself at all - flashing his driver's license and being tempted by a blonde haired woman for sex. But it turns out not to be Sam after all, but a teenaged boy. We then first see the real Sam (and Dean) as they're visiting the home of a former babysitter of theirs whose daughter has been attacked by a poltergeist.
5.12 Ending: At the episode's end, Gary switches back with Sam and they return the kid to his parent's house, telling him that his life really isn't that bad (a lie) and that Nora likes him. Then they drive off in the rain.