Question:
A point $(2, n)$ is 5 units away from the point $(-1, 1)$. What is the product of all possible integer values for $n$?

Answer:
By the Pythagorean theorem, the distance from $(2,n)$ to $(-1,1)$ is $\sqrt{(2-(-1))^2+(n-1)^2}$.  Setting this equal to $5$, we find \begin{align*}
9+(n-1)^2 &= 25 \implies \\
(n-1)^2 &= 16 \implies \\
n-1 = 4 \quad&\text{or}\quad n-1=-4 \implies \\
n = 5 \quad&\text{or}\quad n=-3.
\end{align*} Both of these solutions are integers, and their product is $\boxed{-15}$.