The Towering Inferno
That was my choice several months ago when this theme was done, but it was deemed "sci-fi", not sure why.
Maybe because producer Irwin Allen's name is associated with so many TV science fiction shows -- or because much of what we see in The Towering Inferno
simply couldn't freaking happen!
(The movie's still a great E-ticket ride, though. Just ignore the implausibilities.)