Possible Clues:

• Alien's line of communication?
• Quote from an '82 Spielberg film
• Memorable 1982 movie quote from an alien
• AFI's #15 movie quote
• Famous 1980s movie quote
• #15 on AFI's '100 Years ... 100 Movie Quotes,' from a 1982 film
• ... Debra Winger (heard but not seen)
• Classic 1982 movie line spoken with an outstretched finger
• Spielberg movie line
• Famous line in a Spielberg film