That is actually impossible, since The Kilogram always weighs 1 kilogram. Therefore, all other kilogram weights, and possibly all other objects on Earth have increased in weight. Wait...um...no, that’s right.
Did any one else get that Intro to Physics question about how could you tell if the dimension of ever object in the universe was suddenly reduced by 50%?
The answer is itself a question: "Compared to what?"
Didn't Steven Wright once say that somebody stole all of his furniture ... and replaced it with exact duplicates?