It was a crowded auditorium at Caldwell high school; students sit quietly and listen. When Sean Carter speaks, it's not with a voice you would expect.

Sean communicates through a computer that speaks for him. That's because Sean suffered a brain injury from an accident in 2005.

After leaving a party, a then 22 year old Sean got into a truck with a friend. They had both been drinking. The driver walked away from the crash. Sean did not. Even though Sean is in a wheelchair, he stresses that he isn't paralyzed.

"Thank you for pointing out the brain injury. It has nothing to do with spinal cord," says Sean. His mom, Jenny Carter continues,"More people are living with brain injury in the United States than cancer and heart disease combined."

That decision to get into that truck forever changed Sean's life. It's a decision that Sean and his mother Jenny are trying to prevent other young people from making.

"We tell our kids this. The teachers tell our kids this, but hearing it from Sean... it's powerful," says Tina Taylor, injury prevention chair for the Brazos Valley Regional Advisory Council and Flight Nurse for PHI.

Tina Taylor says if people heed Sean's message that she might be out of a job as a flight nurse for PHI.

"(laughs) I'm perfectly fine with that. We do so much more than trauma and if I never had to take care of another kid with a head injury or another trauma victim, I would be perfectly happy," says Taylor.

The students at Caldwell have heard how drinking and driving leads to accidents. Sean's message talks about how peer pressure can be used to influence their friends to make the right choices.

Victoria Welch is a student at Caldwell High School. "I think if we actually tell our friends, even if they're drinking and they feel the need to drink, maybe tell them don't drive, don't get in the vehicle with anyone, stay at home."

Sean's message is clear, and he'll keep traveling and telling his story to those who will listen.

"If we can just save one life, keep one person safe, then we've accomplished a lot that day," says Jenny.