The Crossing Guard Clause

From the lecture

1. 

   Prof. KenjiToday's demo is A-V-G-O at three hundred sixty-two dollars and eleven cents, down three point eight three percent.

2. 

   Dr.I have three PhDs and I am already filing a complaint with whatever is writing this. Proceed.

3. 

   Prof. KenjiRule one: a stock only moves when a crossing guard waves it on. No stop sign, no trade.

4. 

   Prof. KenjiBro, the sign is red until it isn't.