I do believe it is well to have three or four trick plays in the repertoire, besides the ones just mentioned, as they give the team a lot of confidence. They have something in reserve to call upon in case things get bad in the second half. It is much like a man carrying a revolver feeling much safer about meeting a hold-up man. However, he may be held up so quickly sometime that he will not have a chance to use his gun. And the same thing holds good for the team with the trick plays.
Knute Rockne (1925)
https://www.patspropaganda.com/i-do-believe-it-is-well-to-have-three-or-four/
