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Every language in the universe prefers composition over inheritance =P

Not very true.

Some languages prefer inheritance to express is-a relationships and composition to express has-a relationships. Some languages try to shoe horn is-a into being equivalent to has-a, but they usually have trouble expressing non-structural subtyping.

I find that when refactoring code, I often redefine is-a to has-a anyway.

is-a vehicle --> has 4 wheels

Runtime error: Motorcycle lacks 4 wheels

The ones that don't blossom into interface factories which make factory adapters of abstract factories. (I'm looking at you, Java)

For the lack of a nail, throw new HorseshoeNailNotFoundException("no nails!");

For the lack of a horseshoe, EquestrianDoctor.getLocalInstance().getHorseDispatcher().shoot();

(...)

http://steve-yegge.blogspot.com/2006/03/execution-in-kingdom...

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