>Check that grass a bit more closely. Preferably in a place that has been safely walked or fallen upon.
> You look at the grass very closely...It see-
> SPIKES burst out of the ground, impaling you through the heart, lungs, and brain.
> The flash of light.
> "Oh my, that was cute! Taking a little tug on the green grass in a TRAP INFESTED HALLWAY! Hehehe~. I'm no sadist, but you're failure is morbidly amusing."
> You are standing upright without spikes through your organs.