So, I asked a similar question in the fantasy media forum but I wanted to get answers based on physics from people in this forum. I'm writing a story and I sort of want it to be a reverse Groundhog Day (where time snaps back 24 hours, with only him retaining memories). I thought it would be a cool gimmick to make a story where time 'snaps' forward 20 years, so, if you're currently in your living room, aged 20, you'd suddenly be on a beach in Florida with your family, aged 40. But, nobody notices this snap, except the protagonist, so he must adapt to this future. I was wondering if there's any way to make this storyline work with throwing physics out the window? Or can you at least bend the laws of physics to make it sci-fi?