A couple of weeks ago, the Youtube Channel The Chortle had a brilliant i​dea that takes a real pair of b*lls to pull off. 

This man printed out a series of fake covers, slid them over his book and got on the subway.

*cue the hilarious reactions*

There's a whole list of brilliant ones, for which you must watch the full video, but here are the most hilarious (albeit offensive) ones in the mix.

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The nice thing about this video is how subtle its brand of humour is, managing to be funny and conduct a social experiment at the same time, and not being overt while doing it. 

What's even nicer is how the people react with indulgence and humour, enjoying the joke and hilarity of it all without getting up in arms about it. People giggling amongst themselves and taking pictures seem to be the primary responses, and no one seems upset. Ten points to the audience, really. 

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And now, enjoy...

What do you think?