How I Met Your Mother Season 8 Episode 10 (12/10/12)
-Lily tries to avoid having Marshall's mother stay with them, but the loyal son insists. Marshall regrets his decision when he walks in on his mother and her new love interest. Robin has trouble believing BArney is serious about his relationship with Patrice. She sneaks into his apartment to find The Playbook and show it to her coworker. Ted complains that no one ever returns his things after borrowing them.