In The Incredibles, at the beginning Mr.
In The Incredibles, at the beginning Mr. Incredible advises Dash to fit in and hide his abilities.
Not rocking the boat or standing out is of the utmost importance to survive in that context, to be integrated into the broader machine of society.
Later, when the family is assembled on the island and fighting for their lives, he tells Dash: "I need you to run as fast as you can."
Despite the danger of the situation, Dash clearly feels joy in that moment.
Being able to push the limits of your special ability, to see what you're able to do without any constraints, is exhilarating.