I thought all of the books were funny and you all have pretty much mentioned them all. The funniest for me was:
*Charlie's sex talk...lol i was cracking up
*In midnight sun when Edward makes sure Tyler asks Bella to the dance and Edward watches her reaction and just starts cracking up right there and everyone in the car looks at him like "what the????" - so funny!!
*Jakes chapter titles
*feathers...lol
*Blonde jokes
*Charlie tells Bella that she has to tell her mother...lol and then she doesnt even react angrily to hearing that she's getting married or is even suprised...haha lol
And then Charlies is moping around because Renee did not react the way anyone had expected of her
*Jakes test for Bella and she goes "well i can see what everyone has been complaining about...You stink Jake!"....hahaha
*right before the wedding, for some reason is funny to me...maybe because I am married and I've been through the pre-wedding jitters and all that
*Bella and Edward before they have to leave for their plane...won't stop kissing and everyone around starts chucking or something
*Bella and Edwards' second honeymoon and they discuss why Edward is the best at everything....lol
*Emmetts jokes
*After Italy and Bella refuses to believe that she isn't dead or dreaming
*Quil and Embry in Jakes garage....
*Everytime Edward kisses Bella in Twilight: first she attacks him, then she faints, then she attacks him again, and then in the hospital the heart monitor goes crazy....lol
I can't think of anymore that haven't already been mentioned. There are funny quotes, dialogues, whole scenes that are pretty funny throughout the whole saga
*edit* I just remembered another one in twilight/midnight sun...Edward picks up Bella for school and he asks her, "did you sleep well?" and he just has this look on his face...and because we all know where he was...in her room watching her. It just makes it funnier to me