Per wycats suggestion to overwrite function.prototype.call

function.prototype.call.js

var originalCall = (function () {
                      return Function.prototype.call;
                   })();

Function.prototype.call = function () {
  
  console.log(arguments);
  
  return originalCall;
}

function testFn(arg) {
    return arg;
}

testFn('foo stringy bar thingy');
testFn('still logging');