One of my users unwittingly stumbled upon the most delightful 'env' bug.  It seems to be present in a couple of pretty recent distributions.

Try this:

----------------------------

#!/usr/bin/env

whatever

----------------------------

This results in an endless 'execve' recursion (if that's the word), pegging the CPU.

The preferred behavior would be something like a diagnostic, followed by immediate exit with an error result.

Regards,

Mike