BÄNG is a simple to use Muzzle Flash generator.  The video explains its usage and options.

A word reg. its 3D-nish:

You’ll notice, you can drag the flash just 180°… that’s because it is only 1 frame ‚long’ - you can not differentiate, it is pointing to you or away from you

When you extend the generator, a lil’ bit of randomness varies the flash …

Enjoy movie making.

… that clown mask is really horrible …..