Othello

"...my ancient. A man he is of honesty and trust." Othello (1.3.321)
Here, Othello is talking about Iago. He says that he is honest and trustworthy. I got a huge laugh out of this because that is completely false. Iago is the absolute opposite of honest and trustworthy and i can't believe Othello would think such a thing. It shows a lot of idiocy on Othello's part.

"Sir, would she give you so much of her lips as of her tongue she oft bestows on me, you would have enough." Iago (2.1.112)
I thought this quote was funny because Iago is describing his wife, Emilia, very promiscuously. This is after Cassio kisses her and then tells Iago he was just showing courtesy. Iago tries to show that he is tough and that it doesn't bother him because he gets him way more action.