Because I go distracted and did it last week. Made about 4 passes before I realized I wasnt cutting grass. You see, on my 3rd to last account of the day, the transmission in my Honda 21 went. At the 2nd to last account, I started mowing with the WB and my dad lifted up the Honda, put it into gear and showed me the wheels still spun if they were in teh air, but as soon as you dropped it down it wouldnt move. I disengaged the blades and idled down to hear him..then just throttled back up and started mowing. Doh!