Zero K by Don DeLillo:
Three people came toward me, one of them a boy in a motorized wheelchair that resembled a toilet. He was nine or ten and watched me all the way. His upper body was tilted severely to one side but his eyes were alert and I wanted to stop and talk to him. The adults made it clear that this was not possible. They flanked the wheelchair and stared straight ahead, into authorized space, stranding me in my pause, my good intentions.