mangoes
however for a specific group of people, eating mangoes can cause an interesting allergic reaction. and here's a random link about that.
the problem is that even if the person who is allergic stops eating the now-forbidden fruit, the memory remains. the mouth-watering memory that sometimes defies logic; the person might sit down and enjoy the mango, with his/her favorite brand of anti-histamine + emergency contact number at his/her side. no i'm not even joking, i promise you.
it isn't sane, but it happens. and not just with fruit either. ...now where did i put my benadryl...