"I know you ... who are you again, what have you done?"
That's only one of the awkward and slightly embarrassing things the so-called fans of celebrities like Channing Tatum, Jake Gyllenhaal, Reese Witherspoon, Al Pacino, Mark Ruffalo, Keira Knightley, Benedict Cumberbatch and more stars say to them after recognizing them on the street.
The celebs above -- plus other familiar faces from "The Hunger Games," "Arrested Development," "The Fault In Our Stars" and more -- all revealed some of their funniest fan encounters to Vanity Fair in a brand new video.
From Jennifer Connelly getting confused for Demi Moore to Elizabeth Banks constantly being told one of her hilarious lines from "40-Year-Old Virgin," it's pretty interesting to see how these stars are approached out in the real world!
Have any of you ever had an uncomfortable experience with a star? Share it in the comments below!