Rubber bands, you probably have some in a drawer somewhere or maybe holding a stack of photos together. They stretch and you can use them to hold things together, or, if you are so inclined, you could shoot them at a family member occasionally. Or you could even stretch them out and play a little tune.
But have you ever noticed what happens when you stretch a rubber band out for too long? After a while it loses its ability to snap back. Whether it is a rubber band or a pair of stretch pants, or even a pair of socks, stress them too much and they stop working.