Flashing the lights is a method of quickly getting the attention of a whole
group of people.
Getting attention this way should only be done by
people familiar with the Deaf Culture. Newbies tend to overdo it.
(Flash too many times, too quickly, etc.)
Open the hands, close the hands, and
open them again. This is a way to tell someone to flash the overhead lighting
off and on a couple times.
TEACHER LIGHTS-FLASH, WHY? (Why does the teacher flash the lights?)
The answer to this question is "So that the students will look up and pay