World's Greatest Knock Knock Jokes

Lately I've been wondering, "Whats the greatest knock knock joke in the world?"

#5
Knock Knock.
Who's There?
Art.
Art Who?
R2-D2.

I think this one is kinda lame.

#4
Knock Knock
Who's There?
Olive
Olive Who?
Olive you (I love you)

Meh....

#3
Knock Knock
Who's There?
Atch
Atch Who?
Bless you.

I heard this one a lot when i was in Texas, but I don't really think it should be in the top five

#2
Knock Knock
Who's There?
Lettuce
Lettuce Who?
Lettuce in! it's cold out here!

Lame....

#1
knock knock
whos there
I am

This one is my favorite!!!!!

Do you know any good knock knock jokes?

Tornadoes in the south

So there has been loads of tornadoes in the south. I: know some family there who has gotten very lucky and have not encountered any of these deadly storms. On the other hand I also know some other people who have been hit hard by the tornadoes. Some people had to use a boat to get to some stores. Some other people have had their whole house destoryed. Aren't you gald we live in Colorado were we don't have to worry about thinks like this? I am.