Anyway, the episode I refer to is about 'The Melty Man', which is a codename for the anxieties, fears, and negative thoughts that cause men to have erection problems. Anyway, when one of the characters recalls the legend of the Melty Man, he is asked to describe him. He describes him as 'Darth Vader, without the helmet'.
In a later scene, another character, who was warned about the Melty Man, but didn't believe in him, has an encounter with the Melty Man in the bathroom, just before he is about to 'perform'. It went something like this:
"You don't know what happened to your erection."
"I know enough. Jeff told me you killed my erection."
"No! I am your erection!"
"Noooooooooo! That's not true, that's impossible!"
"Search your feelings, you know it be true!"
You guys have to see it. It's bloody funny.