Favourite Double Bills

Sometimes you watch one movie, and then you want to another right after, ya know? What are your favourtie double bills?

A few of mine are:

Escape From New York & The Road Warrior
Halloween (1978) & Halloween II (1981)
Clerks. & Clerks II
Dazed and Confused & Fast Times at Ridgemont High
The Terminator & Terminator 2
Robocop (1987) & The Terminator

And a few triple bills:

The Evil Dead trilogy
A Fistful of Dollars, For a Few Dollars More, & The Good, the Bad, and the Ugly
Friday the 13th Parts 4, 5, & 6 (aka "the Tommy Jarvis trilogy")
Halloween, Halloween II, Halloween III
Back to the Future trilogy
Night of the Living Dead (1968), Dawn of the Dead (1978), & Day of the Dead (1985) (although I still love to watch Land of the Dead too)
Original Star Wars trilogy
Indiana Jones trilogy