This never stops being funny no matter how many times you watch it.
I think Marisa Tomei won or was nominated for an Oscar for this... and it was well deserved. In a lot of her movies she played the role of "a pretty face" but she not only stood her ground against Joe Pesci but she actually out shined him in a few scenes.
That is a hard thing to do, usually when Pesci is cast he's the best part of the film... and he was priceless in this... and Marisa Tomei out did him.
So what you have is a movie that is endlessly quotable, completely hysterical, and has two of the best performances you'll see in any movie, drama or comedy... with a script that backs it up.
Movies don't get better than this.