There are two things Madonna can't do (yes, just two) - the first is, of course, act -- Madonna can't act. The second is dance Argentine tango. Look, Madonna can do practically everything better than I can (except act & dance tango), so let me make fun of her gancho/boleo combination at around second 59 of this video:
I'm also astounded at how unnatural she makes the most basic hand gestures look. "Evita" is arguably the worst music video this woman ever made. But all the others are just fantastic.