The Ornithophobia Diffusion

The Orithophobia Diffusion is the ninth episode of the fifth season of the CBS sitcom The Big Bang Theory. It aired on November 10th, 2011.

Summary
Leonard and Penny spend the night alone together, strictly as friends while Sheldon tries to overcome his fear of birds.

Title Reference

 * Ornithophobia is a type of specific phobia defined as an abnormal, irrational fear of birds while diffusion means to scatter or spread thinly or wastefully; the title may also rely on using a homophone for diffuse, namely defuse, which is to make less harmful, potent, or tense. In this episode, Sheldon's bird anxiety gradually diffuses after he comes into contact with a Black-throated Magpie-Jay.

Video
Video:The Big Bang Theory - Preview: The Ornithophobia Diffusion