I don't know if this is the same documentary I saw on PBS several years ago. After watching it I couldn't figure out why my cheeks hurt until I realized I'd been grinning with delight the entire hour and whatever. Not many performers can make you do that.
I'm with you. It doesn't matter how many times you see the same routines, they remain astonishing and delightful. Sometimes I'm smiling at what I know they're ABOUT to do.