Well to be technically correct a Haiku should be about something natural like the wind, or trees or whatever or have references to natural images.

A Haiku without natural elements/imagery is called something else also with a Japanese name (whose exact name escapes me for now).

For instance this haiku (from the book Cryptonomicon by Neal Stephenson)

Two tires fly. Two wail.



A bamboo grove, all chopped down



From it, warring songs

Now if you removed the reference to "a bamboo grove, all chopped down" (and replaced with something else: say
"empeg, car, Hijacked software").
Then it wouldn't be a Haiku anymore as it no longer has anything to do with nature/natural images/things.

Heres a second from the same source:

Antenna searches



Retriever's nose in the wind



Ether's far secrets

If this haiku didn't mention Retriever (this image being one of a dog) and the wind, then it too would not be officially a haiku any more.


Just my 18 syllables worth...