  Uniquely heavy with mass at the weak scale, the top quark may have large
flavor changing couplings to Higgs bosons that are as yet unexplored. We show
that such couplings can be directly probed at the LHC through the parton
subprocess $c(\bar c)g \to t (\bar t)A^0$, where the pseudoscalar $A^0$
subsequently decays into $t \bar c$ or ${\bar t} c$, giving rise to the
intriguing final state of like sign top quark pairs. After demanding
$\ell^\pm\ell^\pm$, missing energy and two $b$-jets, the major background turns
out to be $q\bar q' \to Wt \bar t$, which can be partially suppressed by jet
counting. The signal can then manifest itself in the asymmetry of numbers of
$\ell^+\ell^+$ and $\ell^-\ell^-$ events. To further improve the signal over
background, efficient $t$ vs. $\bar t$ tagging methods should be developed.
