Yeah, DUH!

I was passing through Macy's the other night when I had to make a little detour. I found this sign hanging in every stall of the ladies' room:


Is this really necessary? Now, I do realize that this is one of the few multi-stall bathrooms around here that hasn't adopted that nifty motion sensor flusher technology. And I realize that much of the general populous has grown used to said sensors. But do we need a little paper sign reminding us that--in this particular public bathroom--we have to do the flushing ourselves?
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Besides, most of us still have manual flushers in our homes. So we don't exactly need to be reminded as to when and how to use them.
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This sign is akin to something one might find in a nursery school bathroom reminding children to wash their hands before returning to class. And when I'm shopping in a major department store, I don't care to be treated like a preschooler. I get enough of that from my color and design instructor.