In past, I have been asked in not so subtle ways for petty bribe from authorities at Delhi (India) and Johannesburg (South Africa) airports. They leave me irritated but it does not compare to what some of the most vulnerable people have to go through. Quite often, you look at corruption as a minor irritant and then you go about your business. It should not be like that way.
Corruption hits the poorest people the hardest.
"When low-level officials pick the pockets of the poor, it is also often a reliable indicator of greater corruption higher up the bureaucratic and political hierarchy. " From The New York Times - In Bangalore, India, a Cuddle With Your Baby Requires a Bribe [Link]