Since birds are prey animals, they tend to get scared of the most random things! My cockatiel is no exception. I have a fluffy scarf that I wear on the coldest days (it's very warm), but I can't put it on where Buzzy can see it, or else he freaks out. He also doesn't like it if I wear a hat near him, and I have a few colorful shirts that I can't wear around him. New toys also make him nervous - he'll hiss at them for awhile until he figures out that they're harmless. He's still scared of a bell I bought him over a year ago - I can't put it in his cage.
For those who have or have had birds, what are some random things that scare (or scared) him or her?