I thought it might be beneficial to collect some examples of questions when an answerer goes "beyond the call of duty" to deliver an excellent answer. I mean answers that are not only excellent, but where the answerer delivers a much better answer than anyone would expect for that question.
For example, consider this answer in my question about the difference between
__repr__ in Python. Note that the answer was added a long time after the activity on the question seemed to have stopped and it answered many questions that I didn't ask, but I wanted to know the answer to nonetheless.
So, any other examples?