The Obamas Crash African-American Film Festival at Martha’s Vineyard

Barack and Michelle Obama made a surprise appearance at a film festival this week -- perhaps not too surprising though ... it was at Martha's Vineyard.

The former First Couple took the stage Friday at the Martha's Vineyard African-American Film Festival -- where they said a few words before a screening of their Netflix doc, "Descendant." As you can see, they were very warmly received ... the crowd seemed shocked they showed.