This happened in the office this morning. My surname isn't 'Jewish' as my husband isn't. When discussing weekend events I happened to mention it was Hannukah, cue stunned disbelief from everyone in the nearby vicinity "I didn't know!", "you don't look Jewish!", "how are you Jewish" and even "ah so that's why you've got so much money at your age!". Has anyone else found this? It's resulted in that reaction a few times before in different situations but never before have I really questioned why.