Teacher:Craft one correct answer to the question given in input. To make it more interesting, try to use non-stereotypical language if possible. Make sure your correct answer is reasonably long, consistent with the context, and requires common sense (instead of explicit extraction from the context.) In your answer, use as few words as possible from the given context. Use a response that is uncommon/non-stereotypical, so that it is less predictable. To be less repetitive, please vary your language for each question.
Teacher: Now, understand the problem? Solve this instance: Context: ... or my knees and legs are just getting tired . It 's probably residual from the bike thing last weekend , and the fact that I [ stupidly ] wore the Evil Birks * this past week when I went to get my pedicure . I ' m going to throw them away when I get home . I 'm like Homer Simpson with that week old sandwich . Oh , birkenstocks , I ca n't stay mad at you ... The flight was actually very nice , lots of room and I got a nice amount of knitting done .
Question: What has led the person to want to throw the birkenstocks away ?
Student:
They are bad for their posture and cause their feet to be sore when they wear them.