1. Flamingos on the Ice
This tradition carries some backstory to it, starting in March 2018 against the Calgary Flames. After taking a 1-0 lead, a fan (and season-ticket holder) named Drew Johnson threw a flamingo onto the ice. Thus, a new post-game celebration was born, with fans tossing flamingos after every Golden Knights victory.
While cities have embraced their form of thrown objects on the ice (see Detroit with the octopus and Nashville with the catfish), Vegas has put its own Sin City flair on this. Thank goodness it isn't a live flamingo, though. PETA would've had a few words with the Vegas Golden Knights.