[[http://tvtropes.org/pmwiki/discussion.php?id=8bet6jce&trope=ButterflyOfDoom From YKTTW]]

MorganWick: As a subtrope of ForWantOfANail, this is basically "the consequences are always negative". How does that not warrant merging with the ForWantOfANail entry?

{{Lale}}:
* This is s ''not'' necessarily ForWantOfANail, where lacking the smallest, seemingly insignificant element ruins everything. You could be adding an element to the past that changes everything for the worst.
* This strictly involves TimeTravel.
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{{Earnest}}: So... any particular reason the pic is gone? (Later) Ok, if there are no objections then I'm putting it back.

{{Earnest}}: [[Later]] Why do people dislike the Bart-butterfly so much that they cut it without explanation twice now? It was cut again by {{Admiral_Kelly}} and been replaced by a new image (though that was someone unrelated). So, for the tropers consideration, keep the new image or switch back to this one?

[[TheSimpsons http://tvtropes.org/pmwiki/pub/images/BB2.jpg]]
[[caption-width:170: ''"No one ever suspects the butterfly."'']]