Recently, I saw a Tamil movie where an Ukrainian girl hangs the USB on a chain around her neck. It not only provides safe house for the USB but also gives the protagonist to flirtatiously use his fingers around her neck. Well, I haven't found anyone hanging USBs around their neck except in movies.
Take the case of my young friend. He keeps the USB on a key chain. The key chain contains other important keys, his house key being one among them. The trouble with such an arrangement is when you are leaving work in a hurry. You want to copy files in a hurry. You connect USB, copy files, juggle with million other things and run out of the door. You did everything except disconnect the USB.
This is a likely scenario. Imagine there is a bridge. In local parlance, a bridge means a working day that is sandwiched between a weekend and a holiday. If you take the bridge (translates to a day off), you have a long weekend of 4 days. My young friend did this mistake on such an occasion.
Luckily, the USB was still attached to the computer when he returned back to work.