Pop-bottle snap-on cup makes ice cream floats on demand – Boing Boing The Fizz Cup is a cup that screws on to the top of a pop bottle. You fill it with ice-cream and squeeze the bottle and the soda rushes over the ice-cream and turns into an ice-cream float that fizzes out and into your gob, sparing you the mess of making ice-cream floats the old way. Yeah. This is nothing new; I had a gadget called a “Fizz-nik” when I was a little kid in Albuquerque. Mine looked like this, except it was green and white. It was…