Bet nearly everyone gets a tractor stuck sooner or later - or else they aren't pushing it to be all it can be /forums/images/graemlins/grin.gif...
Couple of years ago I was down in an area of pasture that has a spring underground. It is usually dry enough, though, that I can drive on it. But this was right after a hard rain and I sank my tractor in to the frame, front and rear tires a spinnin'. Had to have a neighbor come over and pull it out.
And earlier this winter I was getting some wood from my neighbors place and could not get the tractor up the hill. Was slidin' all over...until I figured out that it was in 2WD /forums/images/graemlins/blush.gif...