Paula loved her cat more than anything so, one day, she was horrified to see the cat hadn't moved for over three hours.
It just sit there staring at nothing. Not an ear flicked nor did the tail twitch. Picking up the at and pointing it in a different direction also changed nothing. The cat just continued to stare straight ahead without moving.
Picking up the cat, Paula took it to her Veterinarian and asked him what could be causing such a strange behavior.
The vet checked out all of the vital signs, its eyes, ears and mouth. Nothing seemed wrong but just like when it had been at home, the cat continued to stare straight ahead at nothing.
The Vet asked Paula, "Did you feed him anything different or give him anything different to drink?"
Paula said, "Why, yes. Right before this happened, I gave him some seltzer water. I thought it would be good for him and make him happy."
"Ah ha!" the Vet said. "Didn't you know? You should never give a catatonic?"