Here are a few classic SciFi scenes:
Forbidden Planet
The tour of the Krell complex.
The battle against the monster at the spaceship.
The Planet of the Apes (the original)
The final scene on the beach.
Star Wars
The opening Star Destroyer fly-over.
Alien
The alien ship.
The Empire Strikes Back
The asteroid chase.
Blade Runner
The city fly-over.
The Return of the Living Dead
The battle against the first corpse.
Prince Of Darkness
The computer readout, “Your god…”.
The Fifth Element
The city scene when Leeloo escapes.
V for Vendetta
The first terror bombing.
What does everyone else think?