“Once In A Lifetime” is the first single by the pop-punk band All Time Low following their eighth studio album, Wake Up, Sunshine, and their hit single “Monsters.”

On March 21, 2021, the first half of the chorus was leaked in a short video posted by the band’s social media:

The video containing the snippet references the TikTok trend around their song “Dear Maria, Count Me In” started by user yungricepatty that band members Alex Gaskarth and Jack Barakat also joined.