"You mean you fixed this guy's toilet?"

"No, the other plumbers, dweeb".

"Oh, yeah".

3 is Susan in Hogfather, and doubles as a CMoA. "I'm in touch with my inner child. And it's fun." "Hi, inner child. I'm the inner babysitter." owned. 

The "knife and ballpoint pen" quote is from the Nancy Drew movie, I think.

#1  "The *insert place that would totally give it away* ?? We'll never survive there!!!"
"Nonsense! You're only saying that because no one ever has!"

#2  "You swords grown old and rusty, burnt beneath the rising sun. It's locked up like a trophy forgetting all the things you've done. And though it's been a long time, you're right back where you started from. I see it in you eyes that now you're giving up the gun"       

#3   "Tonight will be the night I fall for you, over again. Don't make me change my mind, cuz I won't live to see another day, I swear it's true, cuz a girl like you is impossible to find, your impossible to find."

#4  person 1: "*insert a certain name here*, who is he?"
person 2: "Who's who?"
person 1: "The mouth-breather hiding under you bed!"
person 3: "You can hear me breathing?!"

#4 person 1: "You wouldn't understand! Your- your just a silly girl!"
person 2: "Better a silly girl with a flower than a silly boy with a horse and a stick!"
person 3: *as person 2 storms away* It's called a lance! Helloooooo!!

#5 "How doth the little crocodile
Improve his shinning tale
And pour the rivers of the Nile
On every golden scale!

How cheerfully he seems to grin
How neatly spreads his claws
And welcomes little fishes in
With gently smiling jaws!"

#6 "I'm sorry, Captain, but the complexities of human pranks escapes me.
"It's not a prank, *insert name*, and I'm not Captain, not, you are."

#7 "They're coming to take me away, ha-haa. They're coming to take me away, ho-ho, hee-hee, ha-haa! To the funny farm where life is beautiful all the time and I'll be happy to see those nice young men in their clean white coats! And they're coming to take me away, ha-haa!" 

#8 "It is strange to think, I haven't seen you since a month. I have seen the new moon, but not you. I have seen sunsets and sinrises, but nothing of your beautiful face. The pieces of my broken heart are so small that they can be passed through the eye of a needle. I miss you like the sun misses the flower; like the sun misses the flower in the depths of winter. Instead of beaty to direct its light to, the heart hardens like the frozen world your absence has banished my to. I next compete in the city of Paris. I will find it dead and in the winter if you are not there. Hope guides me. It is what gets me through the day and especially the night. The hope that after you are gone from my sigh, it will not be the last time that I look upon you. With all the love that I possess, I remain yours. A knight of your heart."

#9  Person 1: *sees a man with no clothes walking along the road*"Oi, sir? What are you doing?"
Person 2: "Uhh... Trudging. You know, trudging? *pause* The slow, weary, depressing yet determined walk of a man who has nothing left in life besides the impulse to simply soldier on."
Person 1: "Uhh, were you robbed?
Person 2: *laughs* "Funny, really, yes, but at the same time a huge, resounding no. Its more of an... involentary vow of poverty, really."

#10  Person 1: *keeping beat for dance lessons* "And one and two and three and four and your hands should be light like a birdie on a branch. And one and two and three and four and *person 2's name (he's a male, btw)* doesn't lead he follows like a girl. And
Person 2: *punches person 1*
Person 1: And one and two and twirlie, twirlie, twirlie! And one and two and your still getting it wrong! And one and two and three and four you can punch punch me all day cuz you hit like... a what?
Person 3: A GIRL!