In point of fact the medical is effectively invalid if you fly whilst knowing you have a medical condition that would otherwise prevent you from holding the certificate
That's one of the best points made in this thread so far. . . . . . . . . apart, of course, from the one several people have mentioned - namely the grossly irresponsible attitude demostrated by the OP. You should be aware that in these circumstances any insurance would also be totally invalidated, so in the event of even a minor accident everyone loses out.
At the end of the day, this boils down to a quality that every single aviator should have, "AIRMANSHIP". Unfortunately, not all do, as this thread clearly shows.