Have you noticed how manufacturers do not want you to open their products?  Buying them is easy, but try to open something securely packaged in cardboard and plastic.  It is almost impossible without superpowers.

I bought a serrated knife.  It came in a clear plastic case.  I cannot figure out how to open the damn thing.  I suspect Superman would have trouble opening it, too.

Oh well, I plan to live forever.  I will wait for the plastic case to disintegrate, and then I will be able to get at the knife.