Is it free?

The McDonalds at Holborn; just like eating hamburgers in a large public lavatory

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On one of our recent photo walks Ian popped into a Starbucks (they've become as common as lamp-posts in London these days) for a latte. Just before taking his money, the assistant asked in a chummy tone:
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'Would you like an extra shot of coffee in that?'

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As is the way with many corporate outlets these days, a blatant sales pitch was being wrapped up in the language of friendly hospitality. In times gone by a question like that would have been taken as an offer of a complimentary something extra. A token of custom well-appreciated. Many of us retain the programming from these bygone, innocent days and the likes of Starbucks and McDonalds exploit that. Quite ruthlessly. Clearly, all these thoughts passed through Ian's head in a nanosecond because he replied:
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'Is it free?'

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The assistant looked confused, laughed nervously and said 'no' the extra shot would cost one pound twenty, or something like that.
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In a stroke Ian changed my life forever. I now had the perfect riposte for all those times in McDonalds when some gimp has asked me:
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'Did you want the meal?'

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or

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'Did you want to Supersize that?'

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My usual response is to get annoyed that some acne-ridden twerp was implying that I was too stupid to order properly or that an insincere offer of 'clarification' would trick me into buying 2p's worth of Coke syrup in a cup for £1.10. Yes, I would normally be rude.
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But that's all in the past. Thank you Ian. You have empowered me beyond words. Well, three words actually:
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'Is it free?'

(as an aside it might be useful one day to know that 'acne', like 'taxi', 'pizza' or 'papa', is pretty much an international word that sounds similar in a very large number of languages. The challenge is, of course, to try and come up with a useful sentence that incorporates several of these words without the use of verbs)