The Panty Piñata Polarization

Summary
Penny touches Sheldon’s onion rings and is soon banished from his apartment. They both refuse to apologise and begin to escalate their petty behaviour. Leonard eventually steps in to bring peace. Meanwhile Howard and Raj learn about America’s Next Top Model and work out where their house is located.

Critics
"Episodes like this speak to you as a viewer. They tell you that the premise of the episode was to have Penny and Sheldon argue. It wasn’t about their respective characters or their relationship, the writers just thought it would be funny. That’s fine on occasion but much of this season has felt like that. “What can we make Sheldon do this week?” It’s frustrating because episodes like this have no real purpose and when they aren’t very funny they irritate." - The TV Critic's Review