Calling Signals

The teacher was giving her pupils a quiz on counting. Jackie got things started by counting from 1 to 10.

- Now, Fred - said the teacher - you take over, beginning with 11.

- 11, 14, 23, 42, 26 - said Fred.

- What kind of counting is that? - asked the teacher

- Who's counting? - replied Fred.

- I'm calling signals.