The Zero Power Rule of Integer Exponents states that any non-zero number raised to the power of zero equals 1. Therefore, we have:
\[ -4^0 = 1 \]
Now, applying this to the expression:
\[ -4^0 \cdot 15 = 1 \cdot 15 = 15 \]
So, the final answer is:
\[ -4^0 \cdot 15 = 15 \]