What scares your pet? Some sound, noise, a person? Are they freaking out when you're singing? Or running away from the mixer?

My male cat is a real scary cat. He runs like hell from the vacuum cleaner, hair drier and he's always hiding when the garbage men are emptying the containers. And of course, bathing is on his top list. My female cat, however, is very scared of two things: cat transporting box (for going to the vet) and flushing a toilet. Lol =) So, how about your pets?