Scarlet Flower

There was a sofa that looked to be 40ft tall, and that was just the seat cushion. Panicked, the man's eyes scanned the room, noticing how everything was bigger than him.

Trying to rack his brain, the man tried to think of any reason why he was so small and what this place was. For some reason, he couldn't remember anything.

Or:
A man woke up at three inches tall in a giant castle living room with no memory of why he was there or what happened to him.