A CodePen by Paul Reny.

index.html

<canvas id="stage"></canvas>

script.js

/*
  Original: http://retromodular.com/
*/

var glitcher = {
	init: function () {
   setTimeout((function () {
   
		  this.canvas = document.getElementById( 'stage' );
		  this.context = this.canvas.getContext( '2d' );
		
		  this.initOptions();
		  this.resize();
		  this.tick();
   }).bind(this), 100);
	},
	initOptions: function () {
		
		var gui = new dat.GUI(),
				current = gui.addFolder('Current'),
				controls = gui.addFolder('Controls');
				
		
		this.width = document.documentElement.offsetWidth;
		this.height = window.innerHeight;
		
		this.font = 'bold 12vw Arial';
  this.context.font = this.font;
		this.text = "GLITCH";
		this.textWidth = (this.context.measureText(this.text)).width;
		
		this.fps = 60;
		
		this.channel = 0; // 0 = red, 1 = green, 2 = blue
		this.compOp = 'lighter'; // CompositeOperation = lighter || darker || xor
		
		this.phase = 0.0;
		this.phaseStep = 0.05; //determines how often we will change channel and amplitude
		this.amplitude = 0.0;
		this.amplitudeBase  = 2.0;
		this.amplitudeRange = 2.0;
		this.alphaMin = 0.8;
		
		this.glitchAmplitude = 20.0;
		this.glitchThreshold = 0.9; 
		this.scanlineBase = 40;
		this.scanlineRange = 40;
		this.scanlineShift = 15;
		
		current.add(this, 'channel', 0, 2).listen();
		current.add(this, 'phase', 0, 1).listen();
		current.add(this, 'amplitude', 0, 5).listen();
		
		var text = controls.add(this, 'text');
		text.onChange((function (value) {
			this.textWidth = (this.context.measureText(this.text)).width;
		}).bind(this));
		controls.add(this, 'fps', 1, 60);
		controls.add(this, 'phaseStep', 0, 1);
		controls.add(this, 'alphaMin', 0, 1);
		controls.add(this, 'amplitudeBase', 0, 5);
		controls.add(this, 'amplitudeRange', 0, 5);
		controls.add(this, 'glitchAmplitude', 0, 100);
		controls.add(this, 'glitchThreshold', 0, 1);
		controls.open();
		// gui.add(fizzyText, 'noiseStrength', 0, 100).listen();
		
	},
	tick: function () {
		setTimeout((function () {

			this.phase += this.phaseStep;

			if( this.phase > 1 ) {
				this.phase     = 0.0;
				this.channel   = (this.channel === 2) ? 0 : this.channel + 1;
				this.amplitude = this.amplitudeBase + (this.amplitudeRange * Math.random());
			}
			
			this.render();
			this.tick();
				
		}).bind(this), 1000 / this.fps);
	},
	render: function () {
		var x0 = this.amplitude * Math.sin( (Math.PI * 2) * this.phase ) >> 0,
				x1, x2, x3;

		if( Math.random() >= this.glitchThreshold ) {
			x0 *= this.glitchAmplitude;
		}

		x1 = this.width - this.textWidth >> 1;
		x2 = x1 + x0;
		x3 = x1 - x0;

		this.context.clearRect( 0, 0, this.width, this.height );
		this.context.globalAlpha = this.alphaMin + ((1-this.alphaMin) * Math.random());

		switch( this.channel ) {
			case 0: this.renderChannels(x1, x2, x3); break;
			case 1: this.renderChannels(x2, x3, x1); break;
			case 2: this.renderChannels(x3, x1, x2); break;
		}

		this.renderScanline();
	},
	renderChannels: function (x1, x2, x3) {
  this.context.font = this.font;
		this.context.fillStyle = "rgb(255,0,0)";
		this.context.fillText(this.text, x1, this.height/2);

		this.context.globalCompositeOperation = this.compOp;

		this.context.fillStyle = "rgb(0,255,0)";
		this.context.fillText(this.text, x2, this.height/2);
		this.context.fillStyle = "rgb(0,0,255)";
		this.context.fillText(this.text, x3, this.height/2);
	},
	renderScanline: function () {
		var y = this.height * Math.random() >> 0,
      o = this.context.getImageData( 0, y, this.width, 1 ),
      d = o.data,
      i = d.length,
      s = this.scanlineBase + this.scanlineRange * Math.random() >> 0,
      x = -this.scanlineShift + this.scanlineShift * 2 * Math.random() >> 0;

		while( i-- > 0 ) {
			d[i] += s;
		}

		this.context.putImageData( o, x, y );
	},
	resize: function () {
	 if(this.canvas) {
			this.canvas.width = document.documentElement.offsetWidth;
			this.canvas.height = window.innerHeight;
	 }
	}
};

glitcher.init();
window.onresize = glitcher.resize;

style.scss

@import "compass";
body { background: black; overflow: hidden; }
img { display: none; }