Top 10 reason why......
Vegeta is always pissed:
1) Hemroids
2) Krillin gets all the babes instead of him
3) He was rejected by all the babes he asked at his high school prom
4) Because Frieza controlled him all his life and destroyed his planet, no that can't be it
5) He's short
6) He's married to Bulma
7) He's half bald and not even 30 yet
8) He's consipated
9) Did I mention he is married to Bulma yet
10) Bad haircut

Gokou is always happy:
1) He smokes to much pot
2) He's not always happy his face is stuck that way
3) He's a cartoon character
4) He gets to become a kid again who else has?
5) He is actually gay and uses Chi-chi to hide it
6) He is the first Super Sayain in about 10,000 years
7) He can kick the drap out of about anybody
8) I can't see why he is married to Chi-chi
9) Might have something to do with being the strongest
10) He takes to much pain killers

Piccolo doesn't talk much:
1) Doesn't have anything to talk about
2) He is shy
3) His teeth are yellow
4) He tries to hide his stuttering
5) Didn't learn the ABC's
6) He has braces
7) Has bad breath
8) Doesn't like to talk
9) Has a girly voice and is hard to make it sound deep
10) Sore throat

You watch DBZ:
1) Because you love the darn opening theme and background music to
2) To drool over that cutie Trunks
3) To learn all the cool moves done by the Ginyu Force
4) To look at the Z warriors great bods
5) To learn have to fly
6) To copy their hairdo's
7) To please your annoying little brother or sister
8) Because Gokou is your hero
9) To find out what a Namekian is
10) To find out why your little brother/sister is always screaming Kamehameha at you

I got most of this humor from serem1985 visit his site