Failure to pay reminds me of this old joke:
A boy was at a mental arithmetic class. The teacher put the following question to him:
"Your father owes someone £10000 and agrees to pay it back every month in equal instalments for a period of 10 months. After 4 months, how much does he still owe?"
"£10000, sir"
"Rubbish, boy - you don't know your maths. What's your name?
"Maxwell, sir - and you obviously don't know my father Robert!"
