This was a rarity around my late older Brother, Murray. He love tuna casserole so much it was impossible most of the times to have leftovers. If there was I sneaked in the middle of the night or very early morning. Get the mayonnaise, sometimes tarter sauce or cocktail sauce, a slice of bread and get a bit of cold tuna casserole. Make a lone foldover sandwich, or a full one. Now the rarest of all were the triple lol. I was only able make one, while he was around. These can be eaten on any type of bread including rye, sourdough, and Cuban bread. Super delicious midnight snack. He would always whine and cry the blues when a dabble of the precious tuna casserole was missing. I'd be laughing and running to the hills to get away. Yes he was that serious about tuna fish!! You would have to be quick, to wolf it down, so have the bread ready. As soon as you uncover that casserole, he would smell it, wake up from a sound sleep, and start an investigation, on who is messing with HIS tuna casserole. Some old memories!!!
Sometimes I would stick an empty tuna can in his room, or his old Ford Bronco. It would put him into a frenzy, lol.