You don't even need to buy a Roomba lawn mower, all you need to do to rid yourself from the chore of mowing lawns is to make the lawn mower mow itself. How? Be like this guy who strapped his self-propelled lawn mower with rope to a stake in the middle of the yard. The lawn mower ingeniously mows the lawn in smaller spirals as the rope wraps around the wooden stake.

Of course, not everyone's yard can be groomed in a smooth, gigantic spiral but if you can, you never have to mow the lawn yourself (or pay for a gardener). [99bbtom via Reddit]