My DH reported a similar incident on Saturday.
His group ride - about 20 riders strong - was cruising downhill, doing about 30 mph, when a pedestrian stepped off the curb - while looking right at the group barrelling down on him - stopped in the middle of the street and held up his hand like he expected 20 cyclists to be able to stop on a dime, and shouted "WTF!" as all the cyclists split up and rode (safely) around him.
Obviously, he never took physics in high school.
2007 Seven ID8 - Bontrager InForm
2003 Klein Palomino - Terry Firefly (?)
2010 Seven Cafe Racer - Bontrager InForm
2008 Cervelo P2C - Adamo Prologue Saddle