Okay. Hold the phone.

Example of "wit" using "sarcastic language", and, as smitz is helpful in pointing out, "humor":

It is important to always assign the result of a grep or map operation to something, such as a variable or as a return value from a function. If you forget to do this, the function's output data must be piped into the netherworld, which is the only place where it can be safely destroyed. The problem with that is that the demons who work there are slow, and can only process so much data before having to take a break, so if you do this too often and make them work too hard, they will go on strike. This is the same reason UNIX users have been plagued over the years by their /dev/null filling up once in a while and not accepting any more input.

A counter-example:

grep in void context. It's good for you.

Remember, sarcasm is a cultural thing, where some cultures do not have any concept of it whatsoever. That you find it "obvious" is irrelevant. Some people find Norm MacDonald funny, and some people like the music of John Tesh, but these two groups are certainly in the extreme minority.