Doctor Octopus: Perv?

Black Widow:  "Don't even think about it, pervert."

Smashing Pumpkins

Spider-Man:  "That's kinda low, Mr. Stark.  You know, decorating for Halloween by putting out a statue of my enemy, the Green Goblin?"

Seeing is Believing

"Thor!  What happened to the eye-patch?  I heard you were missing an eye."
"I was granted one by a talking rabbit in outer space."
"Okayyyyy…."

Shock to the Heart

Carnage: "C'mon, Shocker!  Get over here and save Vulture's life!  What good is the name Shocker if you can't use those things as cardiac defibrillators?"

Klepto-Amazon

Cap:  "So YOU'RE the one who took my shield!  Give it back!  Next thing you know, you'll be wanting to steal my motorcycle!"