Getting to meet your celebrity heroes, either by total accident, or at an organized meet and greet can be awkward, nerve-racking, and it more than likely never plays out the way you always imagined in your head.
I know this for a fact, because of the one time I met Taylor Swift back when I was 13, I made eye-contact with her, screamed, cried and ran away. Took me a whole 20 minutes to gain my composure.
Luckily these people have way better, more cinematic-like stories.