This is in our opinion one of the strangest Sayian 'facts'. When Vegeta and Mirai Trunks came out of the Hyperbolic Time Chamber after training for one year to defeat the andriods, Trunks' hair had grown alot but Vegeta's hadn't. When Bulma guestioned Vegeta about this he said that a sayian's hair does not change from when he is born, Goku confermed this. It is also a 'fact' that a Sayian's hair is always black.
You'd think there isn't too much to add to this, but there is. If a Sayian's hair does not change from the day he was born, how come Chibi Vegeta had bangs in front of his face and the older Vegeta has a rather large widow's peak?
Also, how come Vegeta was able to grow a mustache in Dragonball GT? He also cut his hait and grew it back later on... That just doesn't make any sense..
Then there's the hair color, Trunks and Bura´s hair isn´t black but that would make sense because they´re only half Sayian. yet, I once saw a picture of Baradock´s army and there was this one woman with blue hair!!?? (I´m not sure if I still have the pic but I´ll look for it) It could be possible that she was a half-breed but Vegeta himself said halfbreeds were simply not accepted by Sayians so why would she be in the army?
A possible answer to that could be that it was Baradock´s army, he was famous for his acceptance and for being more open-minded that the other Sayians.
Still, that doesn´t explain the first thing...therefor, I find this the best mystery about the Sayians