I used 1 hour 26 minute and 48 seconds to generate this image, and I haven't find anyone online made one this big yet. If anyone found this useful, just download though the attachment.

UPDATE: Also include a 5000*5000 prime spiral created in 78.825353 seconds with my small optimization that make it 650 times faster.

At Dinner Table...
Chao: I have a great idea
(Silence)
Chao: I have a great idea
(Silence)
Chao: I have a great idea
(Sound of food chewing)
Chao: I have a great idea
Dad: shut up and eat your food!
Chao: I'm so glad I have a very supportive family.

I'm going to work very very hard to get into Harvard...
...and drop out
...to piss my parent off and increase my blog view...well the blog view is more important...

Ms. Tex. giving us muffins after hurting our feelings:
"You should be embarrassed about your test result."
"Even cave man can do better."
"You guys are going to work at KFC until you are 40"
"Then, you all become homeless"
It's important for you to know that I made the last 3 up for dramatic effect. But I wish she hurt us more so we might get pizza.

Budding Sexually

File shredding is used to destroy the data written on the disk. Usually rewrite the data once is enough to destroy the data, but for extreme measure, use super strong magnetic field.
The function I wrote below WORKS ONLY IF new data is written directly on top of the original file. This will be determined by your file system, and I don't know which file system works, but I know that NFS or Journaling file systems does not work.

function shred($filename,$strength=1,$fast=null){
	$size = filesize($filename);
 
	while($i < $strength){
		$fh = fopen($filename,'w');
		if($fast){
		$str = chr(rand(0,255));
			$str = str_repeat($str,$size);
		}else{
			$str = md5(rand(0,2147483647));
			$n = 32;
			while($n<$size){
				$str .= md5($str);
				$n+=32;
			}
		}
 
		fwrite($fh,substr($str,0,$size));
		fclose($fh);
		++$i;
	}
	return true;
}