Mai Baap is a hilarious comedy, one of the best of Bollywood. It's probably the only film where Johnny Walker acts as the villain. Balraj Sahni is a blind man who wins a lottery. Johnny Walker makes himself the agent of Balraj Sahni and starts milking Balraj's wealth. This is the crux of the film and results in many comic scenes. Unknown to Johnny Walker, one day Balraj regains his eyesight. Now he sees & realizers how Johnny had been cheating him of his wealth. In the end Johnny himself loses his eyesight and becomes a beggar.
Johnny Walker is superb as a slimy character. A must see comedy, I will rate it 8.5 out of 10.