Say this much for Mark Cuban: He has a sense of humor. Or maybe he just doesn't give a damn. When the Free Loaders perform each week at the Standard Pour, band leader John Jay Myers makes the same joke: "If you like what you heard, put $100 in the tip jar," he says. "Unless you're Mark Cuban. Then put in $1,000." Lo and behold, one night last winter, Cuban — of Dancing With the Stars fame — was there, swing dancing his ass off for all the world to see. It may not have been a cash contribution, but it sure was priceless.