Despite being diagnosed with a cyst behind a knee that is causing him pain, comedian Tommy Chong took to the dance floor on Monday on ABC's Dancing With the StarsChong, 76, had posted a video on Instagram on Sunday, which showed him getting an MRI to see if he has what he described as "any serious injuries to the calf." The entertaining Chong and professional partner Peta Murgatroyd have turned in crowd pleasing, if...