The other day my friend Alice (not real name) attempted a FaceTime call to Bob. To both our surprise my phone rang with a FaceTime call from Alice (and as far as we know, Bob never received the call). Holding both our phones together, Alice phone was showing a call to Bob while my phone was showing a call from Alice. A very strange fluke which makes me wonder how robust the FaceTime code is.
Not related to face time but once I sent a two part SMS to my mother (over 140 characters and all that). Her reply made no sense, she was talking about stuff I have not said in my text at all. After much of confused back and forth, I have found out that she received the first part of my SMS correctly, but the second part was taken from some completely random message that probably somebody else sent. I suppose that in some other part of the world there were another two confused people who got the texts mixed the other way round.
Something similar happened to me: I got a FaceTime call and both my phone and an iPhone nearby rang! Both contacts were known to the caller, but the AppleIDs were of course different.
Not sure if this was intentional but in security, Alice and Bob wre the names in hypotheticals for the attacker and unwitting victim since the RSA paper.