The NFL prides itself on having parity among all 32 of its teams; they try to sell us on the fact that all 32 teams have a pretty good shot and competing for a Super Bowl birth.
When we look at the numbers that doesn't seem to really be the case. In fact 18 of the NFL teams have made more than one Super Bowl.
Ten other teams have made one Super Bowl, and four teams have failed to make a Super Bowl. Those teams being; Detroit Lions, Cleveland Browns, Jacksonville Jaguars, and Houston Texans.