As of the 2013-2014 NFL season, the Jacksonville Jaguars, Cleveland Browns, Detroit Lions and Houston Texans are the four teams that have never been to a Super Bowl. The Browns and Lions won NFL championships as recently as 1964 and 1957, respectively, but that was before the Super Bowl era.
On average, onside kicks that happen in National Football League games only work around 20 percent of the time, as of October 2014. Onside kicks were successful 41 percent of the time in 2013. Historically, onside kicks are successful about a third of the time.