What real world events would you blame on a fictional time traveler?

Question

Examples I got are;

*Told Mr. Ismay "The ship should arrive early in New York."

*Told George Lucas to make Kathleen Kennedy president

*Had boyfriend stolen by Rouge the Bat, retaliated by telling people in Asia to start eating members of her species.

Update:

*Gave Chicago Cubs ticket to a random guy name Steve . . .

Answer 1

Failed Particle accelerator experiments.