You've been warned, time traveler. Don't say we didn't warn you.
Killing the cat was a mistake. A big one. A cat-astrophic one. But don't worry, we've all been there.
However, if you insist on killing the cat, make sure you've considered the butterfly effect:
Or, if you're feeling particularly reckless:
Just kill the cat already, but don't say we didn't warn you.