Okay, here are mine:
1999 - I was working at G. Fox before it became Macy's.
James Van Der Beek (of "Dawson" fame, who is a Connecticut resident) wandered in looking for a tie to wear to his premiere. I said, "You look just like Dawson!" He said, "I am Dawson!" I started trembling like a ninny and ran to get my datebook. I asked him for his autograph. The only reason I ended up watching his show was because of that encounter.
2005 - Waiting in line for an entire day to meet
Tori Amos. I was third in line. When I finally got to talk with her, I managed to babble incoherently about how she healed me through her music. She said, "It was you who did the healing" and she posed with me for a picture. I still have it in my purse.
2011 - I never realized
Juliette Lewis was a singer until my then-partner told me. As a surprise for her birthday, I got tickets to see her performance in North Carolina (where we were living at the time). We sat third row and after the show, did a meet-and-greet. Trying to get Juliette's attention for my then-partner (who was painfully shy to meet her), I ended up confusing Juliette and having the most God-awful, hideous picture of myself ever taken (with Juliette but she looked fine lol!). My then-partner finally got her picture taken after we waited in line.
After that, a group of us went to the bar down the street to hang out and who should show up but Juliette and her crew. I talked to Juliette for a bit and got to know her bassist, Japanese solo artist,
Shirley To. (She said she loved my hair and Shirley and I still talk on Facebook from time to time.) Meanwhile, at the end of the night, Juliette walked up to our table and gave my then-partner and I huge hugs goodbye. We were so drunk at the time neither of us believed it really happened until our friends confirmed it the next day. Amazing experience!