On DVD choose the chapters 36-40 and choose chapter 38 "Droid Factory". If you have the timer it happens at 1:39:30. Anakin is lightsabering his way down the production line and he does a fancy twirl so the saber goes forward, down and is coming up behind him and....*gasp* catches on his Jedi cloak! He makes a quick tug and it cuts to Padme. By the way, for an added bonus, pause it and go frame by frame to see Hayden (who plays Anakin) start to laugh.