The Muncher

This is a fly pattern created by Ian Colin James.  It looks great, and Ian claims to have incorporated 3 "triggers" into this fly that will encourage fish to bite.  Those triggers are:
1. Horizontal Legs - move better and more lifelike in the water.
2. 2-Tone Body - more effective than a single-color nymph.
3.  Double Wing Case - anglers claim the double wing case gets more strikes than a single wing case.

Here's a link to Ian's write-up about this pattern:

http://www3.sympatico.ca/ianjames/muncher-nymph.html