San Diego, CA -- We want you to meet a special North County resident who people are calling "The Incredible Shrinking Man."
Afraid he'd die in his 30s, 600-pound Mike Holcomb was even called "Big Mike" as a child.
"I was bigger than my teacher in kindergarten," he said.
Mike says he hit his breaking point on April Fool's Day four years ago when he got into a car crash.
"That shook me up more than anything ever has in my entire life," he said.
Recuperating on the couch, Mike caught a glimpse of himself on his TV monitor.
"I saw myself laying there on the couch, 20 years old, my man boobs hanging over the side of the couch, my gut hanging over the side of the couch, and I just remember thinking to myself, "Is this what a 20-year-old is supposed to look like?'" Mike said.
From that moment on, he started losing about a pound a day for 17 months straight. His sister Brittany still doesn't understand how her brother flipped a switch.
"That's what everyone was trying to figure out, because it is a switch. It's something in his brain that's like, OK it's time to change," she said.
So how did he lose 400 pounds? Mike says he walked a lot, watched his diet, and, "I actually played video games to lose weight."
Mike got hooked on the video game "Rock Band" and would play the drums eight hours a day.
"I got really into it, I played it all day, every day," he said.
In fact, he'd work up such a sweat he started skipping his favorite snack.
"I used to cook up five packages of Top Ramen as like, a midday snack. Five packages, by myself," he said.
Now that the weight's gone, Mike is jumping for joy.
"When you lose that much weight, earth's gravity has literally been decreased for me," he said.
Mike says people in passing cars used to moo at him, but he turned those moos into motivation.
"Whoever that was, I guarantee I'm more fit than they are. I guarantee it, I passed them a long time ago," he said.