My favourite Senators experience is (most likely) when we beat them down in the playoffs many years ago.
Beautiful day with lots of tailgating - even the security staff were cool and would just remind us to put our drinks in plastic cups - then into the arena, leading to one of the most embarrassing losses in the Habs storied history.
Smoked on the scoreboard, pummeled in a 5v5 brawl and the glorious emergence of, "PageauUUUUU!! Pageau! Pageau! PageaUUUUU"
To this day I stand by the fact my buddies and I started that chant.