"You Never Can Tell", also known as "C'est La Vie" or "Teenage Wedding", is a song written by Chuck Berry. It was composed in the early 1960s while Berry was in federal prison for violating the Mann Act. Released in 1964 on the album St. Louis to Liverpool and the follow-up single to Berry's final Top Ten hit of the 1960s: "No Particular Place to Go", "You Never Can Tell" reached number 14, becoming Berry's final Top 40 hit until "My Ding-a-Ling", a number 1 in October 1972. The song performed slightly better in Canada, and also reached the Top 40 in the United Kingdom.

Berry's recording features an iconic piano hook played by Johnnie Johnson. A 1977 Top Ten C&W hit for Emmylou Harris, the song has also been recorded or performed by Loggins and Messina, Chely Wright, John Prine, New Riders of the Purple Sage, the Jerry Garcia Band, Bruce Springsteen, the Mavericks, Buster Shuffle and Bob Seger.