Answer: Episode title!
Some people have a fear of human contact, of others touching their food, or of birds. Then there's Sheldon, who's afraid of all three.
In "The Ornithophobia Diffusion," Amy and Bernadette make Sheldon face his fear of winged animals head-on by forcing him to hang out with a friendly magpie jay. While he could hardly contain his disdain for the bird, at first, Sheldon soon fell in love with his feathered friend and he was able to cross one phobia off his list.