In the 2014 sci-fi movie "Edge of Tomorrow," Cruise's Cage and Blunt's Rita are thrown into a time loop and band together to try and defeat the aliens who have invaded Earth.
Although the movie's screenwriters struggled to figure out where to write a romantic moment between the pair, Blunt eventually took matters into her own hands.
"As we tried to write some sort of a romantic moment between them, it always felt false," Christopher McQuarrie, one of the movie's screenwriters, told Film School Rejects. "It always felt like they weren't focused on what was really important."
"[...] As we were shooting that scene at the very end of the movie, we gave up on the kiss. We weren't even trying to find a place for it anymore," he continued. "And right as Emily was saying goodbye to Tom, she just kissed him goodbye in the moment. And it was not in the script. It was not even discussed on the day. Afterwards, she said, 'It just felt right. It felt right and I did it.'"