Thanks to the increasing popularity of online shopping the competition between shipping companies has grown. DHL found the best way to advertise for their company was to have the competitors do it for them. The prank was ingenious. Using thermal activated ink, DHL hired companies like UPS and and TNT to deliver large black boxes. The trick was that the boxes appeared black because the thermal activated ink turned black when the boxes were frozen to sub-zero temperatures. Once the boxes warmed up the black ink faded showing a large sign on the box stating “DHL is faster”. The deliverymen were caught off caught but were obligated to deliver the boxes.
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