I think it would most likely just be ignored! Similar items, (just not as ascetically pleasing), have been around for years in the form of animals...etc.

I have a pink heart-shaped one left over from when I had a roommate that would just walk in all the time. If my boyfriend was staying over, I'd lock the door anyway, but I usually put the sign up when I just wanted her to buzz off. It's true, though, that it rarely worked... she'd just walk in anyway without knocking.

Great for students in housemate situations, especially during finals week.

Maybe for a college roommate situation.

If you live with people who will respect it, I say go for it. But get one a little more pleasing to the eye.

We have neighbor kids ringing the doorbell constantly. If that would work I would buy it!

I have these for my guest rooms. The ones I have are cool vintage Vegas ones that I bought on eBay though.

AKB2003 - My rude-as-hell neighbors refused to leave me alone, so I finally hung a Do Not Disturb sign on my front door and let it be known among the neighborhood gossips that I would call security if I was bothered again, by any uninvited party, for any reason other than a serious emergency.

It's been up for six blissfully peaceful months. You might consider giving it a try.

I collect real ones from hotels I've stayed at. Some are more visually pleasing than others, but all remind me of a fun place. I keep one on our bedroom from our wedding night - it's the best of the bunch. But they serve no practical purpose.

Me, I'd prefer the "Please Make Up My Room" maid sign.

I handpainted a kitschy one for my Dad a few years ago, but instead of "Do Not Disturb" it reads "No Cat, sleeping" and "Okay, Cat", to let my cat know when he's allowed to go in Dad's room. It was a joke gift but it's been on Dad's doorknob ever since.

I think they can be a handy thing to have. I prefer to have a whiteboard on my bedroom door, I'll leave a note if I don't want to be disturbed.

not not notttery not not. enough of the signage trend.

i recently did a post on my blog about labelling your home with silly words.

http://reddoorread.blogspot.com/2009/01/words-belong-in-books-n-stuff.html

Only really would be successful in use in a roommates situation if both could respect it or for a guest room(s). More than likely in a family situation, people aren't going to respect it.

There are some original handmade, signs of this sort, with rather more creative messages by etsy seller reqbat:
http://www.etsy.com/shop.php?user_id=101999&section_id=5832359

The one pictured here is u g l y. But we have a one on our door that has some vintage wizard of oz pictures on it or something. It's just for looks, doesn't stand out too much.

At this point in my life, I think I'll leave do not disturb signs to hotels.

I have the same one in orange... actually bought it for "someone" to hang it on the office door, since so many people just dropped in without making appointments.

Didn't really work well as door stopper or people stopper.