Chances are you've accumulated a decent collection of soy sauce, ketchup and other condiments that you're probably never going to eat. Rather than toss them out, freeze them. As Yahoo suggests, you can use them as tiny ice packs for your smaller injuries (or injuries your children incur) instead.
If you're not hurting yourself in small ways often enough to use those frozen taco sauce packets, another option is to use them as ice packs in your or your kid's lunch bag. They'd technically work as reusable ice cubes, too, but that's getting into weirder territory.
Five Surprising Uses for Ketchup [Yahoo! Green]