Beautiful day. Stroller, leash, big hill. Walk slow, soak in. 
Pause for usual business, brake on, tidy up even out here.  Steaming pile halfway bagged – 
Oh shit –
 stroller starts to roll.  [Keep clutching undesirable bag]
 drop-leash-grab-stroller-seize-dog-by-collar  ---- Breathe. 
Tie bag. Grip stroller and leash with white knuckles. Laugh. Keep going. 
Dog poop on my skin but I've got us all in hand.