craving a slush mug right about now

Does anyone else remember the ubiquitous Slush Mug of the 1980’s?? I remember that my grandparents had one, and it would always be a the perfect treat for a parched kid who was miles away from the the nearest Slurpee machine. In case you don’t remember, you basically just kept the white inner core in the freezer, and when you wanted a slush, you poured in your soda/juice into the middle and it magically became a slush in about 5 minutes. It was magical and ingenious, and I’m thinking it’s a necessary M household item for the 100+ days of summer… which aren’t too far away from April.