Coca Cola introduced the "New Coke". There was such an outcry that the original formula returned just a few months later. The moral of the story, don't mess with what made you famous in the first place.
The excitement of coming home to a letter (or tons of letters) from a penpal is still, to this day, unmatched. You probably decorated the envelope with Gelly Roll pens and regularly sent each other friendship bracelets. Things Only Girls Can Understand)