Probably a glitch - this used to be an old pick-up code but hey, not my problem if it works with delivery. This is what happens when you hire crap techies. Also, if any store owners use the tired old routine that their not going to accept it, kindly inform them that it has gone through on their system, and it's their responsibility to ensure there are no codes like this that can give ludicrously low prices (there are store minimum prices, most are just too lazy to do any extra work enforcing them).
70761 - 6.95 DELIVERED (Classic Crust Only)
EDIT: Code has been pulled by Dominos. Sigh
I reckon this will stop working within 24 hours.