I've seen a couple of threads recently about horrible things you've overheard someone say about you, or back-handed compliments, so thought it was time for a more positive thread!
What is the best compliment / nicest thing anyone has ever said about you or to you?
One of my favourite ever colleagues said to me how impressed he was that I could talk to anyone, however senior/important, and always seemed comfortable with public speaking. At the time I really didn't feel that way, but it gave me the confidence boost I needed and now I do feel it!