After seeing Benedict Cumberbatch and Jimmy Fallon's impressions of him, Alan Rickman decided to challenge Fallon to a wonderful Q&A using helium, and it's everything. Prepare yourselves for sassy Snape.
Alan Rickman brought Fallon two lovely helium balloons, and Fallon apologized for his Alan Rickman-Off with Cumberbatch.
Then, Fallon asked Rickman about Harry Potter. Rickman inhaled the balloon, and the most fabulous thing ever happened: