Okay, so my mind was wandering yet again on the drive to work this morning. Here's the setup: Let's assume I have designed a time machine. This time machine, essentially, changes the "fourth dimension," time, by slowing it down or speeding it up. (From this point on, any justification for how and why the time machine works will be mostly based off of science fiction and conjecture.) Let's also assume that the time machine only modified time outside of, say, a 1.5 meter bubble around me. Now, if I was standing still, away from a bunch of people, I could turn on the time machine and then walk around those people without much problem. If I bumped into them, let's assume that they'd respond the same way most people do in "time travel" fiction - I, the time traveller, can move or affect or bump into them, but they're "frozen in time" and therefore cannot change me. However, if I was driving, and decided to turn on the time machine, everything outside of the 1.5 meter bubble would slow to a stop except for me. This would mean that I'd, essentially, slam into the steering wheel of my truck with the same force of impact that I'd experience in a car crash. Because I'd have faster inertia - the time 1.5 meters around me is progressing faster than the time outside of that bubble, which would encompass some of my truck - I'd experience a car accident within my own vehicle. I'd have to drive to the side of the road, slow to a stop, then activate the time machine. ...I guess, from at point, I couldn't even use the truck, since the particles of gasoline inside it would be firing and exploding at a slower rate of time than those 1.5 meters around me. Agree? Disagree? Ideas?