I saw an article about Alan Rickman passing, and they included a video of every important scene involving Severus Snape starting from his youth:

Wow, it reminded me just how tragic and powerful Snape's arc was... and what an amazing job Alan did with the role.

I loved Alan in a lot of his movies, from the Harry Potter series to Die Hard and even Love Actually, when he almost cheated on Emma Thompson. Somehow he made even the worst people somehow sympathetic... a truly great actor.

RIP, Alan...