The funniest USA chant is in Melee, where only Mango seems to get it despite 90% of the Melee greats being American
When everyone busted out into the Star Spangled Banner at Apex 2014 in the Mango/Leffen set... Instant best moment of April.
Edit: I will always love the sequence with everyone singing "and the bombs busting in air" while Leffen gets like 3 or 4 Fox up-airs on Mango's Falco. :lol