Some of us enjoy listening to the screams when we chop the heads off of the blades of grass.
That's what that fresh cut grass smell actually is. Biologists have shown that it is a way that grass sends a chemical message that it is under attack. It's supposed to both repel the invader because of the assumed stench, and trigger acid releases in other grasses to make themselves unpalatable.
Nature, however, knows nothing about the attractiveness of the smell to a human being with a lawn mower, a bottle of beer and a cigar on a sunny day, with a baseball game on the radio.