Functions without Laplace transform?

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We have just started working with Laplace transformations at our university course. One of the I came across as following:

Provide three examples of functions for which the Laplace transform does not exist.

We use the book written by Kreyszig "Advanced Engineering Mathematics".

I would have answered where $S > 0$ and $S > K$, I am not sure what the third kind of function would be. In addition I am unsure if this is even the answer they are looking for, I am hoping someone more experienced could provide me with some suggestions. Worst case scenario I get my answer in two weeks time when I hand in the assignment :)