  Kirill Mackenzie raised the following question: given a groupoid morphism $F$
which is continuous on a neighborhood of base, is it true that $F$ is
continuous everywhere? This paper gives a negative answer to that question.
Moreover, we prove that for a locally compact groupoid $G$ with non-singleton
orbits and having open target projection, if we assume that the continuity of
every morphism $F$ on the neighborhood of the base in $G$ implies the
continuity of $F$ everywhere, then the groupoid $G$ must be locally transitive.
