Cats have great reflexes. Sometimes they use them unnecessarily, if they perceive a threat, however harmless.
Take this cat who gets surprised by a cucumber. The cat’s vert is pretty impressive, and I’m a little sorry it was wasted on an overexcited reaction to a vegetable. Still, good to know that nothing will mess with this cat — no predators, no dogs, no people holding cat-carriers — with this kind of natural response.
Do your cats get surprised by everyday items?