Archilles heel

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I am sure everyone has their Archilles heel, and some might even be very weird. In fact, some are so serious that it might even bring literal death. I have a friend who had a relative that died due to eating nuts. She was allergic to it. Some people have acrophobia...they are so afraid of heights that....ok, I think you get the picture. For some it is not a phobia but maybe an addiction...like computer games / online games...I mean some people they can play and just stop whenever but some you will find they can look like as if they are totally possessed by it. Some just can't resist food til it can become harmful and dangerous to their bodies. I'm not asking anyone to share their own unless they are willing to, but I'm sure many of us have observed and might know or seen someone who has very obvious Archilles heel. Care to share?