I held this hand yesterday as dealer.
♠ 963
♥ AJ
♦ KQ85
♣ J643
I passed as did LHO and partner, and RHO opened 1♠. I overcalled 1NT on the theory that it must be "unusual" for the minors, since a passed hand cannot possibly hold 15 or more HCP.
At the table nobody, including my partner, could fathom what it meant. What do you think?