Sharp high-pitched sounds have been found to cause seizures in older cats. The most commonly reported triggers were the sound of crinkling tin foil, a metal spoon clanging in a ceramic feeding bowl, chinking or tapping of glass, crinkling of paper or plastic bags, tapping on a computer keyboard or clicking of a mouse, clinking of coins or keys, hammering of a nail and even the clicking of an owner’s tongue.

Complete article: “High-pitched sounds cause seizures in old cats: Certain breeds more susceptible”, Science Daily.