Maybe not exactly what you were looking for, but some bizarre/unusual "things" that comes to mind...
1962 – Bob Nevin losing one of his contacts and everyone looking for it
1968 - Angry fan at Madison Square Garden with a smoke in his mouth and swinging his belt at Jacques Laperriere and Terry Harper, before being stopped by an NYPD officer
1972 – Wayne Cashman and Jim Schoenfeld being the main combatants when they crashed through the zamboni entrance in the Aud
1973 – New Haven (EHL) goalie Jim Armstrong trying to strangle referee Gordie Heagle…old time hockey
1975 – Players swatting at a bat during the 1975 Stanley Cup finals, with Jim Lorentz finally nailing it
1979 – Steve “Mental Case” Durbano making an exit for the ages, picking up 45 penalty minutes and mooning the fans at Madison Square Garden. He only played four more NHL games after that.
Worth mentioning is that good old Steve had 31 penalty minutes in his last NHL game.
That two game total would put him among the 25 most penalized players in the NHL last season
1979 – All-time classic already mentioned here. Bruins defenseman Mike Milbury slapping a Rangers fan with the man's own shoe
1987 – The pre-skate brawl between the Canadiens and Flyers when guys came out without skates or equipment to join in
1992 – Rob Ray pummeling a Nordiques fan in front of the Sabres bench
2000 – Devils coach Robbie Ftorek throwing a bench onto the ice
2001 - Tie Domi pouring water on a heckling Flyers fan who then fell through the plexi trying to get at Domi
2001 – Instant Karma. Steve Sullivan got cut for a few stitches and was belittled by an out-spoken Avalanche fan as Sullivan was leaving the ice. A short while later that same fan got hit by an errant puck from a Patrick Roy clearing attempt. He was bleeding like a pig and to add salt to the wounds, Sullivan managed to score two shorthanded goals 51 seconds apart in the game
2002 – A Calgary Flames fan scaling the plexi only wearing a wristwatch and red socks, landing off-balance, his head striking the ice, knocking himself out, and leaving on a stretcher
2003 - Battle of Alberta when Oilers coach Craig MacTavish gave the Flames mascot a tongue lashing…
2008 – The Zamboni leaking hydraulic fluid at Mellon arena so that it looked like a player had been run over
2010 - Former NHL-coach Jim Playfair going bananas behind the bench in the AHL
2013 – Adam Pardy getting his helmet ripped off by a drunk Blackhawks fan
2013 - Paul MacLean’s look-alike was pretty funny