Frank L. Sisko wrote:
Don't we already have a thread for this?
I didn't find anything under "regrettable", but it's a very broad topic.
I remember a nasty tasting soft drink from the 1970s:
Shasta Diet Chocolate Soda! I looked online for a picture of the can, but came up empty ... except for this variation.

Diet Chocolate Fudge Soda?!? You shouldn't mix Nutra-Sweet, carbonation, and candy.