For example, there was an unpleasant, though distant, encounter with actor Christopher Lloyd, whom I thought was some homeless dude bumming a smoke next to the Hyatt. As I was walking past I caught a glimpse of him and made the mistake of glancing in his direction just a little too long; honestly, I was crossing the street with my child and had to look around beforehand, and something about the disheveled gentleman seemed really familiar. The man actually scowled at my daughter who happened to make eye contact.
On the other hand, sometimes an actor can barely be recognized because his looks have been downplayed for film roles. Matthew Lewis is a perfect example.
That Time I Discovered that Neville Longbottom is Pretty Cute
The funniest exchange we had with him was about his then-upcoming battle with the giant snake in Deathly Hallows. Ray Park (Darth Maul from Star Wars: The Phantom Menace) was also at that convention at the time, and I suggested to Matthew that he should go to Ray and ask for some fighting pointers.
Matthew chuckled at that and said, “Right then, I’ll just go get that sorted out with him!”