This is fantastic from beginning to end. First of all, Bernadette goes out with Howard's mother for the first time. When she gets back Howard tells her about the engagement and she appears to have a heart attack. Howard wrecks his shoulder trying to break down the door. Penny tells Priya about Leonard's sexual prowess (not). Sheldon is trying to avoid hospital germs and accidentally ends up in a radiation area and can't leave.
Review of The Engagement Reaction
