The comb-over is a hairstyle that indicates the person wearing it has difficulty accepting reality. It is only ever seen on those who are balding on top and its apparent purpose is to hide that fact. Instead it actually highlights it.
The style is achieved quite simply. Grow the hair on one side of the bald spot until it is at least a 1/2 inch longer than the bald spot is wide, then simply comb it straight over the top of the bald spot.
Note that any activity1 that may dislodge the longer hair is liable to produce even more hilarity than the hairstyle itself.