Even the most avid sports lover can find something to argue about, such as a home run that looked foul, a receiver who did not keep his feet in bounds or a goal that looked like it never lit the light.
Then there are more pressing issues for the sports fan to debate, such as whether moving teams from city to city is a good idea, whether a baseball player should be voted into the Hall of Fame in the "Steroid Era" and whether or not these 18 topics are the biggest Sports Betrayals of all time.
Sports have stood the test of time, whether it was a league-wide strike, players jumping teams or moves made by owners that drove us nuts. And let's not forget we live in an era of uncertainty, because we really don't know who is cheating the system or trying to get away with it.
Here's a look at events that have left fans in shock at one time or another.