It's fun to eat something from the Deli at your local store and then finding a recipe on AllRecipes and adapting it so it's even better than what you got from the deli!
Some people call this pistachio fluff. Brandy reminded me that her family called it Watergate salad, which reminded me that my grandma called it the same thing when I was really young.
Put your pinapple in a large bowl, and the package of unprepared pudding on top. Stir until combined and let set for a few minutes to be sure the pudding dissolves. Put in the coconut and stir. Now add the whipped topping and marshmellows and fold them in. Refrigerate for at least a half hour to set before eating (longer is better because the marshmellows will absorb the other flavors). Serve and enjoy!