Hedwig-itis

The fear that Hedwig (the owl from the Harry Potter series) will swoop down at any moment and bite your fingers off one-by-one.

"Hey, let's go outside!"

"Sorry... I can't. I have Hedwig-itis."

Holy Hedwig

A term used by Harry Potter fans in replacement for "Oh my God!"

"The new Harry Potter movie is coming out!"

"Holy Hedwig!"