I have not seen any other fruit like it before. Whereas the taste can be sweet, Caution need to be exercised to avoid injuries.
In fact, if you will like to savage every part of it, you need to be shining your teeth as if you want to bite someone else you get injured by the thorns on it. The fruit is Plum.
After Peeling off the back.
Before Peeling off the back
After Consuming the fruit with the thorny part left lol
Let's Discuss Some...
Plums are rich in vitamins.
They fight cancer cells.
Plums are good in weight loss.
Plums boost immunity of the body.
Other interesting facts about the fruit can be seen on this link
Fun Facts About Plum: Research has shown that plums have over 2000 varieties
I will love to nominate 
@emjoe