This is guaranteed to you smile: a trench coat that lights up and otherwise reacts when its wearer eats a Cadbury bar. They call it the Cadbury Joy Jacket. It’s the brainchild of Hirsch&Mann and the PR firm GolinHarris.
It’s a stunt — not something that could possibly be mass produced — but lots of fun. Take a look.
[vimeo https://vimeo.com/77000013]
There are lots more videos and tech details about it here. Nicely done, all.