Announcements in store come over the intercom saying "fifty percent off", when in reality the items in question are 15% off. I heard several of these announcements, and I wasn't the only one that heard him say 50%. Clever use of near homophones. (via The Consumerist)
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15% off is also usually a typical sale price. IE ... my local CompUSA has Seagate 320GB hard drives for $129.99 at 15% off = total cost of $110.49 + tax. Staples has this same hard drive on sale this week for $79.99 + tax.