my first impression is it’s a play on unity, that they are already going, but he is saying start whenever he wants to? Still, I can’t really tell if they are in motion already… and he is at the front. So I’m confused.

EDIT: 5 months ago on Reddit, someone gave a better answer when I went looking on Google Search: https://www.reddit.com/r/TheFarSide/comments/124clhy/can_anyone_explain_this_gary_larson_cartoon/