  Analyzing general uncertainty relations one can find that there can exist
such pairs of non-commuting observables $A$ and $B$ and such vectors that the
lower bound for the product of standard deviations $\Delta A$ and $\Delta B$
calculated for these vectors is zero: $\Delta A\,\cdot\,\Delta B \geq 0$. Here
we discuss examples of such cases and some other inconsistencies which can be
found performing a rigorous analysis of the uncertainty relations in some
special cases. As an illustration of such cases matrices $(2\times 2)$ and $(3
\times 3)$ and the position--momentum uncertainty relation for a quantum
particle in the box are considered. The status of the uncertainty relation in
$\cal PT$--symmetric quantum theory and the problems associated with it are
also studied.
