they unironically “join the party” in the overworld (they get wiped after re-entering a room i think) if you do this on accident

AND, they give you the Punch Card if you do donate 1 gold…

For context, the Punch Card in undertale was an extremely buggy item that was removed (i think) because of how buggy it was

Inverted Fate’s null 7 (i think) even makes a joke on that