We've all been in those situations where you come up with an idea and you get the response, "We've never done it that way before." or "The client will never do that." I was talking to my wife about this particular frustration and she laid this bit of creative storytelling down on me:
A woman was baking a roast for her family and she cut both ends off the roast before she put it in the oven. When her husband asked her why she did that, her response was that she didn't know why. It was just how her mother always did it. So she went and asked her mother why she always cut both ends of the roast off before she cooked it. Her answer, "Because my oven wasn't big enough for the whole roast to fit in."
Moral of the story: There's a reason why you've "always done it that way." Just make sure it's the right reason.