Vacuum

I have discovered recently that Harrison is terrified of Vacuums. Not just when they are on and you are using it, but if they are just sitting out. He hides in a corner and just wimpers..."Vacuum...bye bye vacuum". I don't know what caused this fear. I know that when he was a baby I really never vacuumed in front of him because I always did it when he was asleep, that is when I had time to do it. I know he probably won't have this fear for the rest of his life, but I really don't want him to be scared of anything. I know this, when we have another baby, I will be vacuuming in front of him all the time!