Here is an example of how NOT to treat your customers.
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Me: Hello can I order a classic burrito w/bacon?
Front counter lady w/the glasses: Sure. That will be $4.06.
*My friend jumps in* I want the same thing.
Me: OK, can we do the 2-for-$5.00 deal?
Front counter lady: No, that's only if we make them at the same time.
*My burrito wasn't even made yet though.*
Me: Are you serious?
Front counter lady w/the glasses: Sorry. That's $4.06 each.
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Wow. Blatantly rude.