You know those videos/articles titled '10 Hacks [This Business] Doesn't Want You to Know About'? On rare occasions, trying out those tips will actually save you some time or money. But 9/10 times, these 'hacks' don't actually work, and all they achieve is anger the worker you have to deal with, which is not something many would recommend. The woman in this Reddit story must have read or heard somewhere that even if a hotel clerk tells you that the hotel is fully booked, if you go ahead and book…