Limitations in Statistical Data

N: hey
Me: hey wassup?
N: I've gotta geek at you.
Me: oooh bring it on!
N: I'm reading the US Census report on County Business Patterns.
And I'm perusing the section on reliability of data.
and this line cracks me up:

"However, the data are subjectto nonsampling errors. Nonsampling errors can be attributedto many sources: inability to identify all cases in the universe;"

Me: LOL
N: I know, I know... stupid dork humor *grin*
Me: :-) no, no, that's great!
N: I figured you might like it!
Me: I do :-)
you know how to pick your geeks