I have heard it is the extra parts of pig that they don't use in other things.
Have you ever bitten into a hot dog and felt something crunchy? Yeah, that's pigs' teeth...gross!
Uh, Lisa, the whole reason we have elected officials is so we don't have to think all the time. Just like that rainforest scare a few years back: our officials saw there was a problem and they fixed it, didn't they? — Homer Simpson