Knock Knock \ Who’s there? \ Iran!

Knock Knock
Who’s there?
Iran!
Iran who?
Iran over here to tell you this!

This is another bad knock-knock joke. There is a pun at the center of it, which centers around the word Iran. Iran is a homophone with "I ran". So, this is funny because the moment when the listener realizes that the jokester was saying I ran instead of Iran. It is pretty lame, honestly, but this is, after all, a lame knock-knock joke.