It never ends

It's not like you've got anything better to do. Plus, that was a really cool rock. But you can't remember which direction you came from, so you have no idea where to find it. Hours of searching leads nowhere. However you do manage to find a different rock, one that's almost as cool. You're careful to put this one in a pocket that doesn't have a hole in it.

You've been walking for nearly a day yet you don't feel thirsty, hungry, or tired. You're beginning to suspect you may be immortal.