It's been set in the Stockholm subway and apparently uses ultra sonic sensors
Rest assured, you won't get Rickrolled. This is a clever mashup of Rick Astley's 'Never Gonna Give You Up', AVICII's 'Wake Me Up' and Chumbawamba's 'Tubthumping.'
DHL tricked their rivals (UPS, TNT and DPD) into advertising for them in quite a brilliant way.
See full post
Whatever works, I guess, when you don't have proper equipment.
From the same guy behind these also brilliant drive thru pranks:
Drive thru invisible driver prank, part 2 and part 3
Drive thru floating cup
Drive thru static shock
Too bad that, for so many reasons, it’s never gonna happen…
A really funny and clever parody. Part 1 here