intra-daydream

n. a daydream lasting only a few seconds, a mini-fantasy that pops into your head as you're doing something mundane—in the middle of lunch, in the middle of a work sentence, in the middle of a conversation—when you suddenly imagine yourself in some improbable situation—wearing a cape, eating a popsicle, bungee-jumping in a wheelchair—and then you snap back to reality, and the sensory details of the place you're actually in, the people you're actually with, seem even more real than the momentary fantasy.