I used to be a big fan of Coke and Dr Pepper and rarely drink soda anymore. I stopped for health reasons though I still enjoy a nice ice cold Coke or Dr P. I once read up on the flavor of Coke which is said to be mostly cinnamon and vanilla and something strange happened: coke went from tasting like coke to tasting like cinnamon in vanilla. It's like how you cant un-hear muddled song lyrics you mistook for something else until you read the lyrics and they became clear. Same with Dr Pepper: vanilla and caramel. Sort of ruined the flavors for me for a while. Made giving it up easier.
One night I Was shopping, passed the soda, and a thought popped into my head: why not try to make my own soda? I have pure vanilla extract, cinnamon and sugar. So I bought a case of seltzer and spent the night making my own Dr Pepper and Coke. I caramelized sugar in a sauce pan for the Dr P which came out pretty good. Overall they were decent analogs but not anywhere near perfect. It was a fun itch to scratch.