I wanted to endorse a good answer to a question (Why is "taking a biscuit" a bad thing in the UK?) that currently has a seemingly bad answer as the accepted answer—but unfortunately I attached the bounty to a different question (Why is "wong" a bad word?) whose accepted answer is perfectly acceptable. (I have since opened a second bounty on the originally intended question.)
Is there a way to undo the erroneous bounty offer? In particular, I am concerned that the misdirected bounty inaccurately criticizes the accepted answer in that case. Sorry that I can't seem to do simple things correctly.