Why do opposites attract? In the world of color, opposites on the color wheel visually vibrate against each other. Such color combinations just "zing". One book I refer to frequently that is endlessly inspiring as regards "zingy" color usage is "The Beader's Color Palette" by Margie Deeb. Every artist should have it in their reference library. This book shows that, really, there are no wrong color combinations.
In the world of humans, opposite personalities can be delicious together or, at times, an abysmal failure. Chemistry is important in order to blend opposite personalities. Truly though, the most diverse of personalities can generally blend when serious effort is applied.
Irony is "the expression of meaning through the use of words which normally means the opposite." An example is the following quote by Robert A. Heinlein, "The supreme irony of life is that hardly anyone gets out of it alive." Now that is zingy.
I leave you with one more quote about opposites that applies to anyone involved in creative pursuits: "It is the stretched soul that makes music, and souls are stretched by the pull of opposites- opposite bents, tastes, yearnings, loyalties. Where there is no polarity- where energies flow smoothly in one direction- there will be much doing, but no music."-- Eric Hoffer