He was fantastic on film, no doubt about it.
But his work as Toni Cipriani in Grand Theft Auto 3 was what I always remembered him for. Bumped into him while I was at the beach on vacation forever ago. I was pretty lit and couldn't remember his real name so I said "ayyyyy Toni!" He picked up on it immediately and did the "do you know who I am? I'll beat the shit outta you for this!"
RIP