Great idea!

Thanks for starting! Here are mine (in no particular order):
BEST COUPLES:
Naomi Watts/Ed Norton in
The Painted Veil
- I was surprised how good the movie was over all. It's one of my favorites. They worked really well together, and I loved how their relationship grew from infatuation (in Ed's case), hate, to love. It was beautiful.
Keira Knightley/Matthew Macfadyen in
Pride & Prejudice (2005)
- I loved them. I especially loved their rain scene and the last scene where Mr. Darcy walks to Lizzie through the morning fog. :sigh: The whole movie was beautiful.
Drew Barrymore/Dougray Scott in
Ever After
- My favorite from my adolescent days. They started off as opposites but became perfect for each other. A great re-telling of the Cinderella story.
Julia Roberts/Hugh Grant in
Notting Hill
- Another favorite from back in the days. The whole premise of a famous actress falling for a regular joe is a bit too unreal, but the story works. Hugh's charm and Julia's charisma here made the couple work.
Meg Ryan/Billy Crystal in
When Harry Met Sally
- Superficially, they make an odd-looking couple, but they worked so well together! I loved their amusing banter, and I loved how they felt so comfortable with each other and how they knew each other so well. It felt really genuine.
WORST COUPLES:
All of the couples in
Valentine's Day
- All of the couples did not work. The chemistry felt forced, awkward, and contrived. It was cringeworthy.
Drew Barrymore/Eric Bana in
Lucky You
- Usually, Drew's pretty good in creating chemistry, but I felt nothing between these two. It just felt really bland and monotone.
Evan Rachel Wood/Larry David in
Whatever Works
- Woody Allen didn't make it work for these two this time. I just couldn't see why Evan's character fell head over heels for Larry's character. :shrug: With the right writing, it could've worked.
Hilary Swank/Gerard Butler in
P.S. I Love You
- It didn't feel believable. The whole movie was just bad.