Just came across a couple of odd tidbits while looking over the list of 500-goal scorers.

Four of the 41 players to hit that mark did so on an empty net.
Mike Bossy - January 2, 1986
Wayne Gretzky - November 22, 1986
Jari Kurri - October 17, 1992
Keith Tkachuk - April 6, 2008

Even more strange: Three scored their 500th against Patrick Roy.
Steve Yzerman - January 17, 1996
Joe Mullen - March 14, 1997
Brendan Shanahan - March 23, 2002

Only two players - Espo and the Chief - have scored their 500th as a Bruin. The next player in line to hit the mark is Jarome Iginla, who looks to be 2-3 seasons away.