As he drove along the road, he began to feel funny.
he began to feel himself de-aging.
he thought of regressing to 20 years old, or to 18, to be a teenager, or to 8, to be a boy again, Then, he pictured himself continuing to shrink, possibly to babyhood.
"Wow!" Dave said, as he felt himself shrink a small bit. "I'm getting younger!"
and he was.
He saw in his side mirror that his stubble seemed to be fading.
Also, his clothing began to get looser. His pants slipped down a bit. His feet knocked about in his boots. His shirt sagged. he saw his belly deflate, he started breathing heavily, and he was shrinking down as well.
He lost 1 year of age, then another, and another, and another.