Failing students is never fun. The worst are the ones who beg and plead. They just won't leave you alone. They just keep talking in attempt to wear you down as if they will stumble on some sequence of words that will erase the fact that they are unable to differentiate between a noun-clause and a question.
But occasionally you do get the student who is happy to repeat. The student who understands that they struggled with the material and need more time with it. Those are the best.
They are also incredibly rare.