When they arrive at Washington, D.C. and Steve sees the head of the Lincoln Memorial rolling down the steps:
Steve: They're messin' with Lincoln. NOBODY messes with Lincoln! (cue him jumping into battle)
Steve taking in the beautiful naked female populace of Themyscira, and Tempting Fate. What's really funny is his facial expression, which makes it look like he's thinking "Why did I have to say that?"
Steve: This is too good to be true.
[spear nearly impales him]
Steve: And it is.
This moment:
Steve: Tell me, what exactly are we up against with this guy?
Diana: Imagine a god whose sole purpose is to propagate terror, to incite eternal war and fan the flames of hate. A god who won't stop until the Earth's populace, Amazon and outsider alike lies murdered in a battlefield grave.
Steve: ...You smell good.
Diana: Must you flirt?
Steve: It's only natural.
Diana: Suppress it.
The second time Steve tries to kiss Diana, she slaps him hard across the face.
Steve: OW! You crazy Amazonian dragon-lady!
While piloting the invisible jet to shoot down the bomb targeting Themyscira, Steve fires his own missiles, but believes nothing happened and panics. Suddenly the bomb gets destroyed before hitting the island, revealing that the jet's missiles are also invisible.
Steve: Of course. Invisible missiles. Hardy-flippin-har.
