The Incredible Shrinking Man

The Incredible Shrinking Man is a classic science fiction movie about a man, Scott Carey, who gradually begins to shrink. He becomes so small that he can live in a doll house, but being of tiny size unfortunately involves certain dangers. Suddenly Scott becomes the prey of the house cat and later the spider in the basement. The scenes of Scott's struggle to survive are nail-biting at times.

The ending is ridiculously pompous, but still sort of realistic.