Mario gets hit in the head with a wrench

"Very dumb."

- Me

Overall
Mario getting hit by a wrench was an event that caused his death.

Timeline

 * 1) A time machine appears in the middle of the street.
 * 2) Mario is walking past the blue house.
 * 3) Someone throws a wrench at Mario's head.
 * 4) Mario immediatly bleeds out and dies.

Conclusion
Mario is a bastard that deserved to die lol.