I noticed this ever for the first time in a lifetime of living with cats. Little Mojo, after a particular active bout of play, settled down against me and for a couple of minutes was having obvious hiccups. It only lasted a minute or two but if freaked me out, especially since he just got his first booster yesterday, and I was thinking it was an allergic reaction or something. He seemed fine during the very brief hiccup session and he is back to tormenting Dusky (do kittens ever sleep???) but it was a first for me. Anyone ever noticed this before?