Mars Bar bombs

Ok. Here's a bit of trivia that puts the energy needs of the human body into perspective.

1 Mars bar contains about 1 megajoule (239,000 calories) of energy, which is about a 1/4 of the energy released by explosion of one kilogram of TNT, and about 10 times the kinetic energy of a car travelling at highway speeds.

The mars bar isn't that special, by the way. There's an equivalent nutritional energy to be had in 150g of rice!

(Source: Wikipedia "Orders of Magnitude (Energy)")