When we watch the opening credits of this movie, we can hear the title song talk about a hero who:
[…] rode a blazing saddle/ He wore a shining star/ His job to offer battle/ Too bad men near and far.
Now we might hear these lyrics and says to ourselves, "Great, here's another typical Western movie about a dude with a gun who kills the bad guys." But as the movie continues, we realize that "blazing saddle" might also refer to the fact that eating beans and riding a horse can sure make a person fart a lot. And these farts all culminate in one very gassy—and very famous—campfire scene.
This double meaning of "Blazing Saddles" gives us a perfect example of Mel Brooks' humor, which takes a normal image of glory and heroism and makes it into something totally silly (and gross).