Rififi et son Frères (1955)
The Godfather & Godfather 2. These are films you really have to sit down and watch, no distractions. There's so much in them that everytime I see something new.
Is that the one with the longest scene of no talking EVER? Lovefilm recommended it to me when it was a good site, not the corporate bloated monster it is now
Oh behave. It's most famous for the safe cracking heist which is done in complete silence - a 32-minute sequence with no dialogue or music. Marvellous.