One of mine is when I finish wrapping my hair up tightly in the towel to dry after washing, I whack the towel where it’s tucked in, kind of like encouragement to stay tucked for the duration, kinda like a coach does when sending the kids onto the playing field.
When doing dishes, I tap silverware on the edge of the sink to remove any water before putting it into drying rack. Absolutely useless, but for some reason I do it.