A janitor at a Texas medical clinic is lucky to be alive after a freak accident.

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77-year-old Manuel Mendoza was moving a chair in the clinic's waiting area when a tire crashed through the window and smashed into him, sending him flying to the floor.

The tire had apparently flown off a truck on the nearby freeway, rolled through the parking lot and then hit the clinic.

Incredibly, Mendoza was not seriously hurt.

Watch the incredible clip above.

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