This idea popped in my head during my commute to work this morning......Where would a Geocacher put a Hide-a-Key for their home? 

Many people have a house key hidden somewhere in case a family member gets locked out.  Growing up we had an unlocked garage and it was in my Dad's beer fridge in the freezer.  I was thinking in a fake bird house or in a porch light fixture.  Where do you think it would be?