Ontech Self Heating Beverages

One day at work, a customer asked me if we carried a beverage/soup that self heats when you shake it up. I was dumbfounded...how on earth does that all make sense? Shake up a can and it will actually heat itself?!? Isn't that like dangerous alone to even exist? Just a roll off the shelf and it could possibly heat itself and explode! So i went home and googled to see if something like this exists and it does...or to say the least..used to exist. This product is created by a company called Ontech and after learning more from its website, I find this product quite creative and advanced. Unfortunately, the company went out of business in November 2008 and I am unable to find the actual product... Talk about inventive product concept!