Lacy has the strangest fear... If something looks out of place, she will be scared of it.
Like one time we went to the lake and the parking lot was white rocks, but one rock was black for some reason... she saw that rock and started freaking out and barking at it and lunging at it. When I figured out what it was, I picked up the rock to show it to her and she freaked out more. She even tinkled when I got it close to her.
She isn't scared of anything "normal"... It's only things that seem out of place.
I hate to admit it, but sometimes when we realize what it is that she is scared of it's pretty funny.