(AP photo/CBS)Crazy bum chic is the new black, apparently, given news of Ryan Adams' unlikely engagement to Mandy Moore and Joaquin Phoenix's odd appearance on Late Show with David Letterman. Maybe it's all just a publicity stunt; he does have a movie coming out, after all, and hip-hop career to promote. Whatever you think is going on with Phoenix, he does sure make for good jokes! Write us a funny caption for this pic of him on Letterman and submit it as a comment below. Check out what's already been said and be even funnier; the best captions will earn a spot in our weekly Caption Call Recap contest.Weigh in on Phoenix's latest and weirdest appearance (and watch it, too!) here on our Z on TV blog.