Infallibility (Papal).—Roman Catholics believe that, in order to speak infallibly, the Bishop of Rome must be sitting in the Chair of Peter. It requires elaborate hoisting equipment and a small army of workmen to get him into the thing, and most years the Vatican simply does not have the budget for papal infallibility. This is why popes so seldom define dogma ex cathedra and usually just make slightly grumpy remarks about current affairs.