Yes, blame the internet, Apple Store has a text box to type in what you want engraved. Anyway, I read your post and had visions of this conversation -
Hello I'd like an engraved iPod please
Yes sir, what would you like engraved?
bettasish, yes we can do that for you sir.
No I said bettafish, not bettasish.
Yes sir, bettasish will be engraved on your iPod.
NO. BETTAFISH! B-E-T-T-A-F-I-S-H! FOR F**K SAKE!
Ah I see sir, so thats b-e-t-t-a-s-i-s-h .....
But yeah I'm sure they will let you replace your engraving.