Wearing one is a great idea; blowing it has many problems: see "The boy who cried, 'Wolf!'", for one.
Also, annoying and scaring people is not the objective. Much better for people to ask you why you're wearing one, or better, yet, to see lots of people wearing them, and for the sporting goods stores to begin reporting shortages.
Only blow the whistle when you see something that needs exposing (yes, I know that's pretty often).
What do you think? http://consequeries.com/