Programmers do it with Unix. Programmers do it with bugs. Programs do it in loops. Psychiatrists do it like crazy. Psychologists do it best at variable intervals.
Psychologists think they do it.
Quantum Mechanics do it with uncertainty. Racers like to come in first. Racquetball players do it off the wall. Radio and TV announcers broadcast it. Radio Engineers do it with Frequency Radio Engineers do it till it MegaHertz.