Another aspect of social engineering that is seldom discussed: Women will have a higher success rate at any sort of information-extraction, in fact, I would say that it is a "social engineer" method in itself. The crying baby sound-effect? Simply icing on the cake.

If a male with a naturally brooding voice contacted a service provider to extract a password, his chances of success are lower because he is less trustworthy by nature, which increases the odds of the operator on the other end raising suspicion.