A genie grants a man one wish for a good deed the man did.
The man says "Please build a bridge from here to Hawaai so that I can drive there whenever I want"

The genie says " Oh, it is a very very difficult task. Immagine all the labour work involved sinking concrete pillars to the bottom of the ocean. Can you please ask for a more easier task"

The man says "Okay, please let me get a full understanding of a woman's brain, about her mood changes, what causes them to nag their husbands etc"

The genie thinks for a while and asks "How many lanes do you want on that bridge"