Myself, travelling back in time from the future, because 10 quid then would be the equivalent of 10p now so I'd borrow 10 million off him(me) and it wouldn't be worth much to him(me) but it would to me(me) and then I'd spend it on a time machine and wait a bit until inflation made 10 quid worth only 10p when this all started then go back in time to now(the past, in the future) with 10 million quid in my pocket.