  We discuss a novel manifestation of the $SU(2)$ global anomaly in an $SU(2)$
gauge theory with an odd number of chiral quark doublets and arbitrary Yukawa
couplings. We argue that the massive 4-dim.($D=4$) Euclidean Dirac operator is
nonhermitean with its spectrum of eigenvalues $(\lambda,-\lambda)$ lying in
pairs in the complex plane. Consequently the existence of an odd number of
normalizable zero modes of the 5-dim.($D=5$) massive Dirac operator is
equivalent to a fermionic level exchange phenomenon, level ``circling'', under
continuous topologically nontrivial deformations of the external gauge field.
More generally global anomalies are a manifestation of fermionic level
``circling'' in any $SP(2n)$ gauge theory with an odd number of massive
fermions in the spinor representation and arbitrary Yukawa couplings.
