Crystal was onscreen with Justin Bieber -- in a sly nod to the demographic problems faced by the Oscars telecast, Bieber joked that he was there for the 18-24 year olds -- during a "Midnight in Paris" spoof when the comedian also showed up as Davis.
"Billy, is Biebs the young Sinatra, or am I nuts," Crystal-as-Davis said to himself through the magic of technology.
Crystal would often appear as Sammy Davis Jr. during the 1980s, but the sight of him in blackface at the 2012 Oscars stunned many viewers and media professionals on Twitter.
"If you had 3 minutes for First Blackface of the Night in your #Oscars pool, congratulations!" New York Times writer Dave Itzkoff joked.
Check out a smattering of opinions on Crystal's blackface appearance below.