For years, I’ve shared with friends and clients what I call the bunny theory of code. The theory is that code multiplies when you’re not looking, not unlike bunnies that tend to multiply when you’re not looking. This isn’t to say that multiplying code is good or bad – it’s a characteristic of all code regardless of quality. What makes it good or bad is the quality of the code being multiplied.

Source: The bunny theory of code | NCZOnline