I found this answer from Dr. Neil DeGrasse Tyson - Too hilarious to just keep it to myself! http://www.youtube.com/watch?v=NSJElZwEI8o
Well if they do exist - Will they have any interest in gardening? Or will they rather enslave us to do all the field work for them? Or are they in reality too afraid to make contact with us - Because in all the movies with aliens from outer space, we always end up killing them!