The expression $-2 + (-2)$ is simply the sum of two negative numbers.

When you add two negative numbers, the result is also negative, and you can think of it as adding the absolute values of the numbers together and then applying the negative sign.

So: $-2 + (-2) = -4$

The final answer is: $\boxed{-4}$

Would you like more details, or do you have any questions?

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Here are five related questions you might find interesting:

1. How do you add negative numbers in general?
2. What is the difference between subtracting and adding negative numbers?
3. How would $-2 + 2$ differ from $-2 + (-2)$?
4. Can you visualize adding negative numbers on a number line?
5. What happens if you add a positive number to a negative number?

Tip: When adding two negative numbers, the result is always negative, and the magnitude is the sum of the absolute values.