Funny you say this.
I bought a wireless doorbell before ( and those who know ) you can change the codes in them with these push pins... didn't know they were the same when I first bought mine. One night I was sitting on the couch and my door bell started ringing, I looked out and no one was there. It kept going off and I got tired of getting up think some kid is playing games. So I stand at the door and again, I quickly looked out...no one??? WTF right? so it does it again and I go out and look around the house and didn't see anyone. I noticed some people on the porch down the street and every time the pushed the doorbell button mine went off... well I looked up the instructions and found out about the wireless codes, fixed in 5 seconds...lol
So if anyone has wireless doorbells, you can buy the button separately for a few dollars, just change codes as you drive around messing with people...lol