Here is a story of the late Lord Haversham's schooldays. Glancing through his pocket-book, his mother saw a number of entries of small sums, ranging from 2s. 6d. to 5s., against which were the letters "P.G." Thinking this must mean the Propagation of the Gospel, she asked her son why he did not give a lump sum and a larger amount to so deserving a cause.
That is not for the Propagation of the Gospel, he replied. "When I cannot remember exactly on what I spend the money I put 'P.G.,' which means 'Probably grub.'"