The Maternal Capacitance

Summary
Penny accidentally shoots Sheldon’s sofa cushion with a paint ball gun. He is deeply disturbed by this turn of events and is not happy with the cushion even once it has been dry cleaned. Meanwhile Howard starts sleeping with Leslie Winkle. She uses her control over university grant money to make him do things that she wants.

Critics
"If Leslie and Howard stay together for form a relationship then this episode will have served a purpose." - The TV Critic's Review