Who always told me?

When changes are noticed in worldwide massive hits, it's always a surprise to those who think they know the original. This is the case with Michael Jackson's classic Billie Jean - who always told him to be careful of who he loves?

It's one of his most famous songs, and he's said to be inspired by the never ending line of back stage groupies that were always trying to claim his brothers fathered their children when he was in the Jackson 5.

The line is question is at the end of the first verse.:

People always told me be careful of what you do
And don't go around breaking young girls' hearts
And mother always told me be careful of who you love
And be careful of what you do 'cause the lie becomes the truth 

Yet most people replace "mother" with "mama", as a quick search on YouTube for cover versions confirms.

Fiery origins

The story for the original idea of the song aparrently came to Michael Jackson as he was driving his Rolls Roye, and he because so absorbed in it he didn't notice it had caught fire?