Here's one to the tune of "I'm Looking Over a Four Leaf Clover"

Sharp Lawn Mower

I'm running you over with a Sharp Lawn Mower

That I've never used before.

The first blade will cut you, the second will hack,

The third blade will sever your neck from your back.

And then there's no use explaining the one remaining

Won't bother you anymore.

I'm running you over with a Sharp Lawn Mower

That I've never used before.