
The right answer is:

A Nightmare on Elm Street (1984)
Those who knew the right answer were:
• Spörri:
"Hús númer 1428 á álmstræti, Nightmare on Elm Street"
• Siggi:
"Nightmare on Elmstreet 1. Lokatriðið."
• Frikki:
"A nightmare on Elmstreet"
• Regin:
"Nightmare on Elm Street"
• Arnar Leó:
"Robert Englund? Freddy Krueger? Nightmare on Elmstreet?"
• Sigurjón:
"Þetta er lokaatriðið í A Nightmare on Elm Street"