Largest Bitcoin transaction fee ever paid? What was the largest transaction fee ever paid? Assuming that payment was an accident was the sender able to contact the miner who mined that block and negotiate a full or partial refund?
This transaction (2016-04-26) has even higher fees (291.2409 BTC).

This plot shows transaction fees higher than 1000USD from the past 3 years. From the plot, the April 2016 transaction seems to be the one paying the highest fee.

BitClub offered to refund the transaction, but the whole episode was a bit controversial.