Bhoots are ghosts from Indian folklore, whose feet are facing backwards:
Bhoots are able to alter and assume forms of various animals at will, but are usually seen in human form. However, their feet often reveal them to be ghosts, as they are backwards facing.
Source: Bhoot (ghost), https://en.wikipedia.org/w/index.php?title=Bhoot_(ghost)&oldid=692466844 (last visited Jan. 25, 2016)
Is there a story that explains this revealing deformity?