Today, October 15, it is exactly 34 years from Mario Lemieux best game in the history. He scored twice and had 6 assists.
This is not NHL record, but it is absolutely amazing. The overall NHL record holder is Darryl Sittler (Toronto Maple Leafs) who scored 6 goals and added 4 assists on February 7, 1976.
More info about similar famous moment - Hockey History Famous Moments