The guy just likes to fly

Vulture: "Nice try, Peter, but shooting webs into my eyes isn't going to stop me. Let me tell you about the times I used to dress up as a bat."

Open for Business

"Say, that's a mighty fine Chitauri weapon you've got there, buddy.  I could make it worth your time if you'd like to go into a weapons business together and we split the profit 50-50…."

Imitation

Doctor Octopus: "They say imitation is the highest form of flattery, Parker.  So you must really, really love me!"

Little One

"Stop calling me 'Little One'!  I'm not Counselor Troi, and you're definitely no Lwaxana!"

Steroid Chewie

"Whaddaya mean, there's no more room for me in the cockpit??? That's it, Chewie! This steroid thing has been going on long enough.  It's time for an intervention!"