Laplace Transform of 1

This is the easiest Laplace Transform I can think of

$ \begin{eqnarray*} \int\limits_{0}^{\infty}{e^{-st}dt} &=& \frac{e^{-st}}{-(s)}|_{0}^{\infty} \\ &=& \frac{1}{s} \end{eqnarray*} $