... 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 ?
Answer: Their place of work has implemented a new dress code that no longer allows sandalsThey are bad for their posture and cause their feet to be sore when they wear themThe birkenstocks are interfering with the speaker 's intended style and they wo n't allow thisNone of the above choices .