"laziness"

Hello /sci/,
Could you explain to me why people are willing to go out of their way "to be lazy".
Examples:
  Walking an extra 20 feet to the automatic door instead of pushing open the other door.
  Waiting an additional 5 minutes instead of going up a flight of stairs.
I'm sure you've observed others. Is it just a habit people get into? Has there ever been a study into this.

>>100
sir, you take me for a fool...good for you. Underestimating your opponent is the greatest thing any fool ever did.

Are you retarded? You don't even know the rules of engagement, you have no moral authority to ask me where I live! Go fucking die in a fire, I've truly fucked you up in your ego-castle sumpin fearce!

:/