"O, you are well tuned now, But I'll set down the pegs that make this music, as honest as I am." ( 2.1.220) Iago uses a reference to music, which in The Merchant of Venice, symbolizes the existence of a soul so when Iago says that he wants to take away the music, he is resembled as being soulless. When he mentions himself as "honest" the reader knows that Iago is well aware of who he is and everything he is doing and doing it for a purpose; he isn't just an innocent guy whose at the wrong place at the wrong time.

"Not I for this fair island. I do love Cassio well and would do much To cure him of this evil-" - Iago
 In this quote Iago is pretending to be a nice guy by both pointing the blame of evil on another, in this case Cassio as well as by making himself seem like a loving guy. This kind of  messing with people and beating around the bush proves that Iago is more than just a jerk, but actually evil.

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.