Corpos callosum is a fascinating part of the brain. It is the main highway that connects the two brain hemispheres together. It contains 200-250 million contralateral axonal projections, making it the largest white matter structure in the central nervous system. Besides serving as connection for the two hemispeheres it is involved in eye movement. Information about eye muscles and the retinas is collected by this structure, and sent to the respective areas of the brain where it is processed (Source). The location of the corpos callosum is in the middle of the brain and is fairly well-protected. However, it is fragile tissue and if it suffers damage on its left side, it can distort left brain functions. The same analogy goes for the right side the corpos callosum. The real mystery comes in treatment of seizures caused by epilepsy. When drugs aren't strong enough to control them, a surgery is performed called corpos callosotomy. In this procedure, the corpos callosum is severed to stop the spread of seizures from hemisphere to hemisphere. After such a surgery, it takes 6-8 weeks for the person to get back into normal life with some negative effects. Because the two sides of the brain cannot communicate the person has trouble remembering things, finding words, lack of awareness of one side of the body, loss of coordination and others. It does seem a bit drastic to stop the connection between the two hemispheres but in this way a person can have lead a more normal life than the one haunted by sporadic seizures.
Links: http://www.webmd.com/epilepsy/corpus-callosotomy?page=2
http://www.buzzle.com/articles/corpus-callosum-function.html


