Bomb Threat Standoff Distance Chart
 

Unclas and may be of interest to some.

Source - http://www.eyespymag.com/readingroomcterror.htm

Richard's $.02 :munchin

Thanks, "Richard,". Here's the original SOURCE, they also have some other related resources on the site that may be of interest to some.

I got an easier one for you... Always carry a fresh sugar doughnut.

1) Move away from the site until you can see the entire scene inside the hole of the doughnut.

2) Tap the excess sugar off the doughnut to prove you were there.

3) Eat your doughnut while you watch the show.

Should be effective for all but NBC threats.

:D

Sounds like a modified version of "the rule of thumb". Whereby you move far enough away from the scene until your thumb covers its entirety.:D The donut is definitely more 'delicious' though..