Guilty?

We have a small Little Tykes slide that we normally keep inside but last night we brought it out to the yard and the kids were playing on it. I'm pulling weeds and Lance is mowing and both Beckett and Darcy are on the platform on top of the slide, playing with a little steering wheel. Suddenly, Beckett is lying on his back on the grass, crying heartily, and Darcy is still innocently playing with the steering wheel. We rush over and attend to Beckett, asking Darcy "What happened? Did you push Beckett off the slide?". No answer. "Darcy, did you push Beckett?". Blank stare. We give up and go back to Beckett, but then we hear Darcy muttering under her breath,
"Only ONE people at a time."

Hmmmm.....