We asked the BuzzFeed Community to tell us which actors had the best *and* worst onscreen chemistry in movies (to get a full picture of romantic relationships in film). Here's what they had to say:
Warning: Potential spoilers ahead! 🚨
1. Awkward chemistry: Daniel Radcliffe and Bonnie Wright in the Harry Potter movies

2. Amazing chemistry: Kate Winslet and Leonardo DiCaprio in Titanic (1997)

3. Awkward chemistry: Constance Wu and Henry Golding in Crazy Rich Asians (2018)

4. Amazing chemistry: Jennifer Lopez and Jon Seda in Selena (1997)
5. Awkward chemistry: Natalie Portman and Hayden Christensen in Star Wars: Attack of the Clones (2002)

6. Amazing chemistry: Nicole Kidman and Ewan McGregor in Moulin Rouge! (2001)

7. Awkward chemistry: Leonardo DiCaprio and Carey Mulligan in The Great Gatsby (2013)

8. Amazing chemistry: Jodie Turner-Smith and Daniel Kaluuya in Queen & Slim (2019)

9. Awkward chemistry: Robert Downey Jr. and Gwyneth Paltrow in every Marvel movie

10. Amazing chemistry: Saoirse Ronan and Timothée Chalamet in Little Women (2019)

11. Awkward chemistry: Yara Shahidi and Charles Melton in The Sun Is Also a Star (2019)

12. Amazing chemistry: Lana Condor and Noah Centineo in To All the Boys I've Loved Before (2018)

13. Awkward chemistry: Emma Watson and Dan Stevens in Beauty and the Beast (2017)

14. Amazing chemistry: Brendan Fraser and Rachel Weisz in The Mummy (1999)

15. Awkward chemistry: Mena Massoud and Naomi Scott in Aladdin (2019)

16. Amazing chemistry: Gina Rodriguez and LaKeith Stanfield in Someone Great (2019)

17. Awkward chemistry: Sarah Jessica Parker and Matthew McConaughey in Failure to Launch (2006)

18. Amazing chemistry: Ryan Gosling and Emma Stone in Crazy, Stupid, Love (2011)

19. Awkward chemistry: Chris Pratt and Bryce Dallas Howard in Jurassic World (2015)
20. Amazing chemistry: Cate Blanchett and Rooney Mara in Carol (2015)

21. Awkward chemistry: Jennifer Aniston and Vince Vaughn in The Break-Up (2006)

22. Amazing chemistry: Tom Holland and Zendaya in Spider-Man: Far From Home (2019)

23. Awkward chemistry: Channing Tatum and Mila Kunis in Jupiter Ascending (2015)

24. Amazing chemistry: Issa Rae and Kumail Nanjiani in The Lovebirds (2020)

25. Awkward chemistry: Reese Witherspoon and Luke Wilson in Legally Blonde (2001)

26. Amazing chemistry: Sanaa Lathan and Omar Epps in Love & Basketball (2000)

27. Awkward chemistry: Steve Carell and Juliette Binoche in Dan in Real Life (2007)

28. Amazing chemistry: Josh O'Connor and Alec Secăreanu in God's Own Country (2017)

29. Awkward chemistry: Anne Hathaway and Anders Holm in The Intern (2015)

30. And amazing chemistry: Lady Gaga and Bradley Cooper in A Star Is Born (2018)

Note: Submissions have been edited for length and/or clarity.