While everyone's sad about the death of British actor Alan Rickman today, here's one piece of trivia: J.K. Rowling told producers when they were casting Harry Potter and the Sorcerer's Stone that Rickman was her dream choice for Severus Snape.

Alan Rickman (1946-2016)
Alan Rickman (1946-2016)

According to a 2001 TIME Magazine article:

Rowling also had a hand in choosing most of the adult cast members. She specifically requested [Robbie] Coltrane [for Hagrid]. Others, like Richard Harris as Dumbledore, Maggie Smith as Professor McGonagall and Alan Rickman as Professor Snape came straight from a wish list of actors that Rowling provided the producers.
Sources: TIME