You step towards the curb and start waving your arms. You've got the curious sensation that your feet want to meld with the sidewalk again, so you start hopping from one foot to the other to prevent this from going any further. You've got to get to the hospital, after all. After a short while, you see a yellow taxicab with its blinker on slowing down and changing lanes to reach you. Right before it stops, a grey minivan with tinted windows comes barreling around the corner from the opposite direction and screeches up in front of you, two wheels on the sidewalk. The cabbie looks irritated and honks his horn. You can't see into the minivan.