I'm going to go with Quotes on this one.
1.) "I was once a bad ass vampire, But love and a pesky curse defanged me. Now I'm just a bigg fluffy puppy with bad teeth!".
2.) "Out. For. A. Walk. Bitch"
3.) "Made with care for Randy Giles. Randy Giles? Why not just name me horny Giles, or desperate for a shag Giles? God, I knew there was a reason I hated you!"
4.) "Your a wee little puppet man!" - Spike makes fun of Angel in Smile Time.
5.) "I'm bad! It's just I can't bite anymore, thanks to you wankers... Bye the bye, if you're trying to kill her..." (gives Riley two thumbs up)"
6.) " I do remember what I said. The promise. To protect her. If I'd done that ... even if I didn't make it, you wouldn't've had to jump. I want you to know I did save you. Not when it counted, of course. But after that. Every night after that. I'd see it all again, do something different. Faster or more clever, you know? Dozens of times, lots of different ways ...Every night I save you."
7.) "It was that truce with Buffy that did it. Dru said I'd gone soft. Wasn't demon enough for the likes of her. And I told her it didn't mean anything, I was thinking of her the whole time, but she didn't care. So, we got to Brazil, and she was... she was just different. I gave her everything: beautiful jewels, beautiful dresses with beautiful girls in them, but nothing made her happy. And she would fliiirt! I caught her on a park bench, making out with a chaos demon! Have you ever seen a chaos demon? They're all slime and antlers. They're disgusting. She only did it to hurt me. So I said, 'I'm not putting up with this anymore.' And she said, 'Fine!' And I said, 'Yeah, I've got an unlife, you know!' And then she said... she said we could still be friends. God, I'm so unhappy!"
8.)"She just left. She didn't even care enough to cut off my head or set me on fire. I mean, is that too much to ask? You know? Some little sign that she cared."
9.)"Spike: What's this? Sittin' around watching the telly while there's evil still afoot? It's not very industrious of you. I say we go out there and kick a little demon ass! What, can't go without your Buffy, is that it? Let's find her! She is the chosen one, after all. Come on! Vampires! Grrr! Nasty! Let's annihilate them, for justice, and for... the safety of puppies... and Christmas, right? Let's fight that evil! Let's kill something! Oh, come on!"
10.) And of course when Spike sings "I did it my way" by the Sex Pistols. <3