Dead dog's aren't useless. Though, they're not much fun... They don't come when you call. And, you can throw them in a stew... Hopefully someone catches the reference. I find it rather funny. Useless is more like salt that has lost its savor... (sorry, it was the first thing that came to my mind). Really, everything has a use, if you put your mind to it.
Though, in regards to the DTS files without joints, I'd have to say the only purpose I can see them using is for artistic value. Or to get in someone's way. Or to spam/lag a server... Yah, they're pretty useless. Mouser X out.