I (distantly) knew someone who was cutting grass on an incline adjacent to a pond. The lawnmower flipped, and it pinned him in the pond. He drowned in a foot of water and was sober.
People misjudge things all the time. I would guess it was a combination of distraction and/or non-ideal terrain (slope, dropoff, or combination).
Everywhere I’ve lived, most groceries aren’t taxed, so what’s showing would be the final price.
Things that might be taxed are things like pre-prepared food or soda.