Trace a sine wave with your flag on isitchristmas.com.

Sine.js

var theta = 0.0;
window.setInterval(function() {
	theta += Math.PI/10;
	if (theta >= Math.PI*4) theta = 0.0;
	var event = {clientX: theta*100, clientY: (Math.sin(theta)+1.5)*100, button: 2};
	me.angle = Math.cos(theta)*180/Math.PI;
	setRotate(me.flag, me.angle);
	emit('scroll', {id: me.id, angle: me.angle});
	document.onmousemove(event);
	document.onmousedown(event);
}, 200);