In 2008, Scottish actor James McAvoy made a movie called 'Wanted' with Angelina Jolie. At the time, Jolie was almost universally considered to be the most beautiful woman in the world. There are many men - and women - who would have given almost anything to share a kiss with her. McAvoy found himself not wanting to - but we completely understand why!
McAvoy wasn't as big a name in 2008 as he is now, and found himself a little starstruck around Jolie. He also didn't have any time to get his head around the idea of what he'd be doing. McAvoy had already been filming the movie for two weeks before Jolie was due to join him on set - and the kissing scene was the first one they had together. He'd barely had chance to introduce himself to her before they had to kiss, and McAvoy was so nervous that he was shaking. Immediately afterward, he felt like he'd made such a bad job of it that he felt compelled to apologize.