I like this Honda viral marketing bit centered around a modified mower that set the Guinness record for "Fastest Acceleration 0-100mph for a Lawnmower (Prototype)". Starring Mean Mower driver Jess Hawkins.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...r_fullsize.jpg
Quad-engine ride-on lawnmower - video and photo
Ride-on lawnmower motorcycle - photo
John Deere combine lawnmower made from Simplicity mower