Another of my odd dream bits...
I met a guy in the dream who had made a two seated, pedal powered, riding lawn mower. The extra rider was for more pedaling power.
He had taken a basic riding mower, gutted it hard, then made the blades and wheels move by pedals. They worked off separate gearing, but it did it's best cutting when the wheels were going slow, as the blades were at their fastest.
Interesting concept!
Great dream, that's my favourite sort of guy!
I found a single seater for you.
source Apparently it was pretty good on medium sized flat lawns, but a bit front heavy for going down hill!