Do you have any special soft drink recipe that you'd like to share?

Example: This is one of my favorites. I like to fill a glass with ice then add two parts Mountain Dew and one part orange juice.  It’s damn good. I know that hot Dr. Pepper in a mug with lemon used to be popular with some people. (Although I haven’t heard about people who still drink this.)
What strange mix or style of soft drink do you enjoy? I’m looking to try pretty much anything.