  Many seemingly paradoxical effects are known in the predictions for outcomes
of measurements made on pre- and post-selected quantum systems. A class of such
effects, which we call ``logical pre- and post-selection paradoxes'', bear a
striking resemblance to proofs of the Bell-Kochen-Specker theorem, which
suggests that they demonstrate the contextuality of quantum mechanics. Despite
the apparent similarity, we show that such effects can occur in noncontextual
hidden variable theories, provided measurements are allowed to disturb the
values of the hidden variables.
