This has to be the worse news since we found out about Keyboard Cat's death. New feline research from the UK claims that things like pen clicking, fingernail biting, cutlery dropping, and mouse clicking may trigger seizures in cats.

The research began after a feline charity called International Cat Care began receiving reports from cat owners across the UK of strange behavior from their cats. They contacted researchers at the University College London who investigated the phenomenon and linked it back to the noises:
The seizures in cats do not appear to be related to volume, because many of the "trigger sounds" are relatively quiet. The noises do not appear to be particularly unexpected, either, as most are relatively familiar, such as the noise of food being opened.
The seizures resulting from these sharp, staccato noises will trigger a cat to start jerking its body, and the erratic movement only stops once the noise stops. Some accounts describe cats running frantically in circles before slamming into furniture. We're pretty sure these cat owners will feel relieved to know that their cat is not crazy.

[Telegraph]