Some months ago I transferred some money between two accounts at different banks. The money arrived _twice_ in two different accounts of mine at the destination bank. I contacted them and asked them to cancel the second transfer, but they just told me it would get automatically denied for insufficient funds at the origin. They also warned me that if it happened again my account might have restrictions placed on it.

An apology would have been nice, but I suppose unwarranted threats are more in character.