Possibly only Stargate SG1 fans or fans of Sanctuary might have heard of her, but Amanda Tapping.
I met her a few years ago at a Sci Fi convention when I was sitting outside the main hall. She was right beside me and chatting to other people out there, but when I said hello, intending to compliment her in her role in the show she just cut me dead. Looked through me as if I didn't exist and all I said was hello and she did hear me and I didn't interrupt the conversation which had finished.
I've never forgotten that and it actually made the show less enjoyable for me. I stopped watching it not long