Lynxx
had the hiccups once. It was kinda funny because he was laying on the floor in the kitchen, and every time he hiccupped he moved an inch. He got 1/2 way across the floor before the hiccups stopped. That was the first and only time I ever actually saw
Lynxx
have the hiccups.
Midnight has the hiccups all the time after he eats. He's always hiccupped when he finishes each meal, from the time he first came here. The vet said he eats to fast and takes in to much air, which is 1 reason why he's doing it. Also he has an enlarged esophagus, and swollen thymus which the vet said is a lymph node, and that's the second reason why he hiccups. But your cat isn't hiccupping every time he eats, so you probably don't have to worry about that problem.
Unless
Midnight is in my arms, I can't hear him hiccup, but he does make a sound when he's hiccupping.
As for scaring the hiccups out of Tails, take a picture of a very large mouse and show it to him, tell him that mouse is standing right behind him, that might work

Seriously it's probably nothing to worry about since he isn't hiccupping all the time. But if your still worried, check with your vet, it may seem silly but better safe than sorry.