Knock Knock.
Who’s There?
DOS Attack.
DOS Attack W-
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock
Knock Knock

Yes I know it’s cringey – I’m sorry! 🙂

(Original credit to Reddit user TheFeshy – http://www.reddit.com/r/geek/comments/1ovzc6/networking_joke/ccwabgv)