Frankenstein. The epitome of regretting
your creative choices. Always considered a work highlighting the
dangers of playing God, the book actually has another message: think
clearly about your decisions because you may become synonymous with
You shouldn't have to look back on your work with regret. Everything you do, in a perfect world, should make you feel proud and want to stand up shouting "I DID THIS" not try and find the darkest corner of a room and hope no one notices.
That's not to say the fame and fortune you receive from
your creation doesn't make the work worth it, just that you may grow
to hate and revile the monster you've created, especially when it
chucks little girls into lakes.
This regret isn't limited to fiction,
there are a plethora of examples of people who looked on their work
and wished for an undo option...