Its believed that a Unicorn's horn would retract poision...Now here is a story that I believe is 100% True...

              Once there was a snake that wanted to kill every animal in the forest. So one day the snake poisioned the lake from which every forest creature drank water. They all somehow sensed the poisioned water, but they would still have to drink the lake water beacuse there wasn't another lake within 100,000 miles or so. But then a unicorn came and he/she (Forgot if it was a boy or girl) stuck its horn into the poisioned water and cured it...Then the Unicorn drank, but did not die...Then the other forest creatures took a drink and they as well did not die! The Unicorn did it! He/She unpoisioned the water! Then (I believe) all the forest creatures thanked the Unicorn for his deed...Now I'm not quite sure of what happened to the snake, but I believe he was never heard of agian...