Being excited about buying a lawnmower is a matter of perspective. Looked at in isolation mowing the lawn is a pretty dull and futile exercise because it's only going to grow back anyway, so I can see why you'd resent spending money on a mower. However, viewed in the context of what she'd have you doing around the house instead if you weren't mowing the lawn, sitting on a tractor in the sun with a cold beer and some good tunes or a ball game on your headphones, suddenly mowing looks like a really rather pleasant way to spend a couple of hours, and the best thing about it is that you get to do it every weekend if you really need to get out of going to the grocery store, seeing her mother or clearing out the basement.