When you're picking someone up or dropping something off, or visiting someone's house, how do like to let whoever you're visiting know you've arrived? Do you lay on the horn, do a quick two beeps, use the doorbell, do a quick double knock, or make up a song on their door in knocks? Personally, I'm a song knocker-- hence the reason I absolutely love this idea! You know if you saw this on someone's door you wouldn't be able to resist playing a little tune! A better question would be, who would put one of these up at their house? Do you think it would be funny or obnoxious to be the owner of one of these?