And ffs it's "C of Red" not Sea
Spoiler!
"C of Red"
During the Flames' run to the Stanley Cup Finals of 2004, most of the Flames fans attending the hockey games at the Saddledome wore a red jersey with Calgary's flaming C on it.[43] Sales of the Flames red home jersey, introduced at the start of the 2003–04 campaign, were so strong during the playoffs that manufacturer CCM stopped production on all other team jerseys in order to keep up with demand of Flames uniforms.[92] The team set a league record for sales of a new uniform design.[96] The tradition of the C of Red dates back to the 1986 Stanley Cup playoffs against the Oilers. Oiler fans were donning hats promoting "Hat Trick Fever" in their quest for three straight Stanley Cups. Flames fans countered by wearing red. In the 1987 playoffs against Winnipeg, the Jets responded to the C of Red by encouraging fans to wear white, creating the "Winnipeg Whiteout".[97] During Flames games when "The Star-Spangled Banner" is sung, fans shout the words see and red to signify the "C of Red" theme.
https://en.m.wikipedia.org/wiki/Calgary_Flames