Best Skin Crawling Moment
The Leviathan were supposed to be scary. They were supposed to be the worst foe ever and assured horrible doom for us all. Sam and Dean had to abandon everything to avoid these people, including being cloned by them and put on the most wanted list, killing innocents wherever they go. However, that all fizzled in the second half of the season.
One being actually turned out to be far more terrifying that the leviathan, and he wasn't even real! Lucifer proved that once and for all, you cannot get more frightening that Satan. Out of all the mental torture he subjected Sam to, nothing rips me to shreds worse than the end of "Repo Man." When Sam realizes that the hand trick won't work anymore and Lucifer won't let him sleep, that's horrible enough for him. Throw in "Good Morning Vietnam!", evil laughter and a burning bed, poor Sam's doom is sealed. I'm freaking out just thinking about it. Is that what happened to poor Sammy in Hell?