I am not weinstein

A businessman was sitting quietly in a restaurant eating his lunch when suddently a stranger hailed him.
'Hey there, ' Weintien!' shouted the man. 'My goodness, what happened to you? You used to be short, now you're tall. You used to be bond, and now you're dark-haired. You used to have blue eyes, and now they are brown!'
The businessman was polite but firm. 'I beg your pardon, sir, but my name 's not Weintein.'
'My God!' Exclaimed the other. 'You changed your name , too!'