I just realized that if you were to enter "OM NOM NOM NOM" on a phone keypad, it would be 66-666-666-666. :P
"That is, if while coping an IBSN number you miscopy a single character or transpose two adjacent characters, then the sum (*) will no longer be a multiple of 11."
R.I.P. multiples of eleven ☠ Infinitember ∞, ∞ B.C. - June 23, 2010 A.D.