Turn back the calendar to the 1950's, to a small town in Idaho not far from Bear Lake. On the main drag there's a Rexall drug store where my mom worked as a soda jerk. This is the reason we had a "soda fountain" birthday party for her this year. My daughter made a 50's play list, there were pink and grey balloons and streamers and poodle applique decor.
Vanilla Frozen Yogurt
Lime (quarter - optional)
Add 1-2 scoops of frozen yogurt to a cup. Pour Sprite Zero over the ice cream until the cup is about 2/3rds full. The drink will bubble up, so wait a minute then add more Sprite Zero to fill the cup. Add the juice from a quarter of a lime. Serve with a straw and spoon.