A number of popular Chicago Cubs players had gone on and played elsewhere after wearing North Side colors. Some of them made the Cubs pay for parting ways.
Throughout the history of the Chicago Cubs, it has been pretty rare to see a fan favorite finish their careers with the Cubs. Ernie Banks and Ryne Sandberg are a few exceptions, but most other Cub greats have gone on to either finish their careers with another team or even see their best years/biggest accomplishments with another team.
Some of these former Cub heroes take “revenge” on their former team and put up some good numbers when they play the North Siders. It is rarely out of actual spite, but fans can get irritated when they see someone who used to be a Cub just tearing it up against their team
Common phrases uttered by fans when this happens: “Man remember when he used to do that with us?” Or, “Where the heck was this when he was a Cub?”
Here is a list of players who were once Chicago Cubs, left in any way (trade, free agent signing) and did a lot of damage against the Cubs in another uniform.