Beyond people or pets, the thing I miss the most is Jello Pudding Pops. Anyone growing up in the 80's and 90's must remember these. They were the perfect dessert, like ice cream but not as messy, pudding without a spoon - few pleasures in life exceed the pudding pop. Even the smell was fantastic - when I took off the wrapper, it was all I could do to keep from inhaling it clear up my nose.
Just look at the swirl flavor. A perfect marriage, they were always gone from the package first.
Why are they extinct? Did they cause heart attacks in laboratory rats? Were they too expensive to produce? It's just pudding, isn't it? Maybe some preservative ingredient was found to be addictive. That would not be a surprise.
Bring them back!