Watering the Front Yard

So, this morning I decide to attack the clover that's invading the grass. I carefully measure out 2 fluid ounces of Weed-Be-Gone and then fill up the sprayer to 1 and 1/2 gallons. The next 15 minutes is spent spraying all of the clover--and there's a lot of it. I finish up, clean out the sprayer, come into the garage and find the carefully measured 2 oz of Weed-Be-Gone still in its little measuring jar: All I had done was water the weeds! This time I put the weed killer in the sprayer and repeated what I'd just done--except properly this time. Doh!