Crappiest? They might like that. Think about it.
I see what you did there. :-)
I was thinking more along the lines of way too much or too little sugar. If they complain, you tell them “I did my best, as you know, there are 12 other bakeries within 5 miles of here, but you insisted on me. If you weren’t happy I will understand if you use someone else next time and I won’t blame you if you tell all your friends down at the gay bar.”