Tony Stewart drove 100 MPH with his newborn son Dominic and wife Leah Pruett in the car, after a call from Marco Andretti.
This incident occurred just 20 minutes into their drive home from the hospital.
What happened?
Marco Andretti called to congratulate Tony Stewart on the birth of his son, then challenged him to drive over 100 MPH with the baby in the car.
Stewart initially thought Andretti was kidding, but the challenge seemed to flip a switch.
Andretti claimed he had already done it with his own daughter Micah in the car.
Why it matters for Tony Stewart
The story fits Tony Stewart's personality, who has a history of unpredictable behavior, including surviving a 240 MPH NHRA crash at Reading.
Stewart's wife Leah Pruett was in the backseat with baby Dominic when he reached 102 MPH.
She cussed him for another five miles after he accelerated.
What comes next?
Tony Stewart's actions may have been a way of proving he had not lost his edge, despite becoming a father.
He had previously admitted that drag racing humbled him, as drivers only control 30 percent of the outcome.
Stewart's day started in Phoenix, where his son Dominic was born at 4:43 a.m. after Leah endured nine hours of labor.
He then flew back to Pomona to race his 11,000-horsepower Top Fuel dragster, reaching the semifinals and topping 319 MPH.
The birth of his son has changed his life forever, but Stewart's need for speed remains.
He grabbed a roll of silver duct tape and wrote "DAD" in black marker on his car before the eliminations.
Mario Andretti had told him that fatherhood changes drivers, but Stewart seems to be taking that as a dare.