the thing with z

i wonder why people like to add 'z' at the end of certain words?

last time, i thought adding z to a word makes you sound cool. the word that is dull looking seems to feel more futuristic when it has a z attached to it. i remember my friend's email, something like ...kidz@hotmail.com. it gave me the impression of someone outgoing and active. someone who has a drive for creativity. and then, i started to put z's in all my forum login names because i thought that that's the trend. but, after a few months, i grew bored of the z's.

unlike, e-bill, e-ticket, i-phone, ipod, i-fridge, adding a z to daily expressions is nothing more than a word deco. how on earth did these words-haihz, aihz, lolz, nitez, sienz, heyz, frenz sprout out?

"sien" means boring, in cantonese. sienz is no different from sien, just an extra z there.
who actually invented this z culture? how it become so famous among these few generations and well used in facebook and msn? i have to admit that, i am sometimes annoyed by the overusage of the letter (pms mah!).

imagine your whole conversation over the msn peppered with lots of z's.
will it sounds like this:
a : heyz!
b : heyz! whazzup?
a : kinda sienz here...
b : haihz
a : aihz, me too...
b : lotsa assignmentz to do
a : haihz...hahahahahaz. me too. ganbatte nehz.
b :gtg, ta. wanna catch baywatch
a :lolz. wakakakaz. k. nitez.

? i know it's a lousy conversation. does anyone actually chat like that?