Grass turns out not to be

We have a gravel driveway, which, as anyone who has one knows, is a great incubator for weeds. So whenever my husband or I spot green stuff in the gravel around the yard, we reflexively bend down to pull it out. Tonight, as I reached down for a bit of errant grass, it jumped away. Ah, ha, not grass, but a grasshopper - a very green one.