I washed my hands before the challah blessing on Friday for shabbat. I have been performing this ritual ever since I was a kid. My family often goes to my aunt's house for shabbat. That side of my family is orthodox, and they would always get me and my siblings to wash and then help with the bracha, which also allowed us to be among the first to receive a piece of challah. Now I continue to do it as part of tradition.