If you should write a time-travel and your hero is, hypothetically, a young man belonging to the French militia during the French & Indian War, he’ll probably be wearing a funny hat. A funny linen hat that may have been lovingly and painstakingly hand-stitched by his grandmother. It might look like this:
Then, let’s say your hero time-travels (with his funny linen hat) into the future. Let’s say to 2011. If your hero’s funny, lovingly-and-painstakingly-hand-stitched linen hat gets thrown into a modern washing machine, it might hypothetically then look like this:
Oops. At least, in this story, the hero’s mother is innocent of hat-slaughtering and it was the grandmother who did the loving and painstaking hand-stitching that threw the funny linen hat in with the rest of the laundry and she’s laughing about it, which means we can laugh, too.
And the outer shell was salvageable, so the Tall Kid sat around the campfire every night, taking the entire weekend to hem the outer shell into a new funny hat all by himself with what he calls his “heart-rate monitor stitch”. It’s probably gone from funny hat to goofy hat, but he’s all the more proud of it now.