Thread of bad customers.

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they say no question is a stupid question. That person obviously has not worked in retail or any other customer service job. (assumption)

Speaking as someone who has some experience in retail and customer service jobs, I would dare say that that saying still applies. Sure, questions with blindingly obvious answers can be annoying and tedious to deal with, but it still makes your job easier if you get to educate them and/or lead them through the process beforehand than if they're too afraid to ask questions and just make assumptions...and as you probably know, assumptions make an ass out of you and me.