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Interrupting - Interrupting the barista while they're taking someone else's order.

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Cell phone - Talking or texting on your phone when you get to the register.

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Music - Listening to music loud enough that everyone around you can hear the throbbing bass.

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Drinks - Making crazy drink requests—i.e. "mocha frappe magical unicorn latte with soy milk."

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Bills - Paying for a one-dollar coffee with a US$100 bill.

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Friends - Being overly familiar with your barista and asking them personal questions.

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Bad manners - Stating your order without offering a greeting first.

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Bad manners - Forgetting to say "please" or "thank you."

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Job - Telling baristas how to do their job or reaching into the service area while they're preparing your order.

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Hanging out - Hovering at a crowded counter while waiting for your drink.

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All out - Complaining when something is out of stock.

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Order - Complaining that you didn't order something that wasn't yours to begin with.

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Drinks - Asking the barista to add all of your mix-ins, including sugar, and then complaining that it doesn't taste right.

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Prices - Blaming the barista for high prices or asking why something is expensive—they don't have control over this.

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Favor - Asking them to watch your stuff while you go to the bathroom.

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Size - Not specifying which size you want when you order.

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Staring - Staring at the barista while they make your order.

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Volume - Not speaking loudly or clearly at the drive-thru.

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Indecision - Getting to the register and not knowing what you want.

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Spill - Not telling anyone when you spill your drink.

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Trash - Leaving your straw wrappers and other trash on the counter.

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Workspace - When you camp out all day in the coffee shop working and don't order anything.

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Drinks - Ordering more than five drinks at the drive-thru.

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Complaining - Complaining about the wait while in line.

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Music - Asking the barista to change the music if you don't like what's playing.

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Hot coffee - Pouring hot coffee in the trashcan—it is never a good idea to dump liquids in the trash. Just set your drink on the counter if you don't want to finish it.

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Order - Ordering drinks like you're at Starbucks—"venti," "grande," and "tall" are not universal cup sizes.

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Temperature - Asking for your drink "extra hot." Normally hot drinks already come at the highest temperature possible to not cause burns in your mouth.

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Mess -

Making a mess at the condiment bar—clean up after yourself please!

See also: Coffee from around the world you'll want to try.

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