Raiders Of The Lost Ark - Thirded
Jaws - seconded
John Carpenter's The Thing - space pod breaks through earth's atmosphere (ripped off considerably in Predator), then cut to knackered dog being chased through the Antarctic snow by a trigger happy helicopter pilot.
From Dusk Till Dawn - typical Tarantino intro, but I love the dialogue and the 'shooting out the spirit bottles and throwing the lighter-fluid soaked toilet roll' thing. Then as the two brothers stroll out of the building, bickering as the whole building explodes behind them... just very cool.
Dazed And Confused - Stoned american teenagers turning up to school to the sound of Aerosmith's Sweet Emotion.