For me
"American Beauty", the whole film had such an erie presence. From the kid next door dating his daughter and then later becoming his pot provider, to the kid's psycho father which introduced us to another great actor in Chris Cooper. Even though his part wasn't very big, he was special sort of nut case in
Se7en. In the ending when out in the middle of nowhere, a delivery driver brings a box, only to find out it's the head of Brad Pitt's wife, Gwyneth Paltrow. Of course Morgan Freeman was always the cool head throughout the film. Both of these movies I have watched more than a few times.
I really first heard of Kevin Spacey when I watched a TV show in the late 80's called
Wiseguy. It starred Ken Wahl as a undercover cop deep into infiltrating bad guys. He was so good and his boss while wheel chair bound, usually gave instructions over the phone. One of the bad guys was Kevin Spacey, who usually rode around in a limo creating big problems for the police. It was a really one of the best shows ever, but I belive it was short-live not for lack of great stuff but Ken Wahl was a bit of a problem, I believe after a motorcycle accident he somehow got involved in drugs. I really never saw him much afterwards, which is a shame.