CBS

Season 9: Episode 8 - Thank You For the Intercourse

Thank You For the Intercourse: ­Walden gets rid of Charlie’s old piano which triggers Alan’s grief over the loss of his brother. Alan begins to dress and have casual sex like Charlie. He also starts singing Charlie’s jingles and attempts to shower with Walden. Walden then has Alan institutionalized after it’s clear that Alan has lost it.