I've seen decathlon employ this in their stores as well. Think they're primarily in Europe.
It's definitely weird the first time you do it, but I'm assuming they're using RFID technology, so each product has a little microchip in its price tag.
While we're on the topic of mosquitos, is it true that if you flex your muscles while they are slurping away, that the change in pressure will cause them to explode?
Not tech exactly, but does a 22yr old Vicks inhaler count? It's somehow stuck around through every move, and I can still use it when I have a stuffy nose. It's kinda nuts...
Do you have a link?