My 4 year old actually eggs me on to punch it sometimes. I wouldn't RACE with her in the car, but she loves to just be pushed back in her casr seat, so I get TO the speed limit in a hurry for her...then she gets mad when I stop accelerating...sometimes you just can't get enough.
The wifey knows how I am, and as long as the little one isn't in the car with me, she makes fun of me getting revved on (or whatever the case may be) so I'll run a little harder than legally bound.