My electric company
I moved into a new home iMay, set up a manageable direct debit for my bill at under around 120e. Started mining my ass off, pulling about 4kw per hour at one point. Goiny by estimation on meter reading I am due the company about an extra 2500 -3000e, well i just wanted to thank them for loaning me the electric until bitcoin was at a higher price and i could pay them with a much smaller fraction of my reward.
thank you Mr electric man
ps my actual bill probably won't be settled until next year