Practise a random act of selfless beauty and write off the debt your friend owes you?
I was wondering when someone was going to mention that. The guy pays in bitcoin and they triple in value...cut the friend some slack for sure or become Mr. Burns incarnate.
I would sell the amount required to pay in full the debt of your friend and obliterate that debt. Hoard the remaining coins and forget about it for the next 5 years.
This!