In the novel Something Fresh (1915) by P. G. Wodehouse, a scam is mentioned whereby a man advertises in the newspapers proposing to give a sum of money to anyone who cares to apply, provided he is not a minor.
It was the same old game. A Mr. Brian MacNeill, though doing no business with minors, was willing—even anxious—to part with his vast fortune to anyone over the age of twenty-one whose means happened to be a trifle straitened. This good man required no security whatever; nor did his rivals in generosity, the Messrs. Angus Bruce, Duncan Macfarlane, Wallace Mackintosh and Donald MacNab. They, too, showed a curious distaste for dealing with minors; but anyone of maturer years could simply come round to the office and help himself.
My question is, what exactly is the scam and why the prohibition on minors?