I'm not sure what to do with this. Some say there is no practical use. Others say it's the most valuable thing in the world.
I invented the barrel of NULLS while working at »HM Consulting in the summer of 2002. That summer, we were copyrighting a lot of catchphrases just for fun, then extorting favors from those who used them (imagine my chagrin after saying "there you go" then finding out I owed Red a new set of desktop backgrounds). The problem with a barrel of NULLS is this: While it has Nothing in it, it's not empty. Therefore, it is useless two ways. It is full of useless(#1) things that take up the entire space of the barrel(#2).
The only authorized use for a barrel of nulls is in the following phrase:
More fun than a barrel of NULLs.