Cant believe nobody has mentioned swordfish yet
1) why the hell does he need a pair of 45mbit lines to upload probably a 1mb virus ?
2) why the hell does he need 10 monitors to write a virus
3) what's with all the cubes ? since when was virus writing in any way slightly graphical. When The Matrix showed you trinity hacking into the power station, they at least showed you a linux commandline
4) what's with the cubes not grouping together. You write a virus, yes it takes time, but you dont find out if a virus works or not by seeing if lots of pretty cubes glue together or not
5) how exactly did the police know he had a pair of T3 lines into the house, and why does this mean he has to be up to no good ? he could just be downloading lots of porn
6)at the start of the film, he prooves his hacker prowess by hacking into a government website in under 2 minutes ... by brute force. Exactly how would you crack a government website by brute force. You couldnt just type passwords as fast as your fingers would type. It would need to attempt to check this each time. And im damn sure any government website would just lock you out after 4/5 failed attempts.