It is not clear why cats might be scared of cucumbers. Some people believe that cats are startled by the sudden appearance of a cucumber, as they may not expect to see it in their environment. This reaction may be similar to how a person might jump if they were unexpectedly surprised. Cats may also be scared of cucumbers because of their shape, which is similar to that of a snake, one of a cat's natural predators. Ultimately, the reason for a cat's fear of cucumbers is likely to vary depending on the individual cat and its experiences.