Troll any canvas element

canvas-troll.js

var canvas = document.getElementsByTagName('canvas'),
    img = new Image();

img.onload = function(){
  Array.prototype.slice.call(canvas).forEach(function(el){
    el.getContext('2d').drawImage(img, 0, 0);
  });
};
img.src = 'http://thegurglingcod.typepad.com/.a/6a00d8341c387d53ef0148c84decb8970c-320wi';

Surely to troll any element you want something more like:

var canvas = document.getElementsByTagName('canvas'),
    img = new Image();

img.onload = function(){
  Array.prototype.slice.call(canvas).forEach(function(el){
    el.getContext('2d').drawImage(img, 0, 0);
  });
};
img.src = 'http://thegurglingcod.typepad.com/.a/6a00d8341c387d53ef0148c84decb8970c-320wi';

Good point, updated.

Related: one of the WAW entries uses a lot of canvas.
Also related: not our one.

Ohh dear, I am not enabling vandalism am I?