James at 2011-03-11 14:18:16:
My vote is for insults. :)
Sean Z P Harris at 2011-03-11 14:27:28:
Insults! Pity we can't suggest TV clips as well as Blackadder has some of the funny insults ever filmed.
Neal C. at 2011-03-11 14:54:16:
I gotta go with outrageous lies.
Phil at 2011-03-11 17:53:36:
UNDERSTATEMENTS

"We're gonna need a bigger boat."
Jason at 2011-03-11 19:56:45:
"Caught cheating." Ridiculous excuses that people tell their significant others when they get busted.
Jason at 2011-03-11 20:18:56:
"Caught cheating" Example from "Blades of Glory"

Jimmy: [Jimmy walks in on Chazz and Katie getting intimate] Y-y-y-you sex demon! You sex fiend!
Chazz: This isn't what it looks like.
[Grabs Katie's breast]
Michael V. Brown at 2011-03-12 00:22:26:
All great. I'm looking at outrageous lies though.
lonestarr357 at 2011-03-12 09:21:08:
I second understatements.

Also, I'm probably too late for 'saying "I love you" without saying "I love you"', but I thought of a great one, from Finding Nemo.

Dory: "No. No, you can't... STOP. Please don't go away. Please? No one's ever stuck with me for so long before. And if you leave... if you leave... I just, I remember things better with you. I do, look. P. Sherman, forty-two... forty-two... I remember it, I do. It's there, I know it is, because when I look at you, I can feel it. And-and I look at you, and I... and I'm home. Please... I don't want that to go away. I don't want to forget."
Atlanta at 2011-03-12 09:21:38:
Understatements! What a great idea, boat example made me snicker.

For DD theme, how about seeing things from positive perspective, example from 300:
Persian: A thousand nations of the Persian empire descend upon you. Our arrows will blot out the sun!
Stelios: Then we will fight in the shade.
Clip here, last few seconds.
Scott at 2011-03-12 11:33:32:
Okay, it's a run-off: Insults vs. Understatements. Whichever one gets the most examples, that's what we'll go with next week.