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...