The Killers' "Mr. Brightside" just beat Oasis' "Wonderwall" as the UK's best-selling single to never hit No. 1, and fans are losing it! The band's cheeky Insta post about the news only fueled the debate: is "Mr. Brightside" the true anthem of the 2000s, or is it just millennial nostalgia? The comment section is a battlefield right now! #Entertainment #Music #TheKillers