That shirtless guy in the video is a comedian named Bert Kreischer. At the end of the night, as he explains in the clip, he likes to to a raffle for the waitstaff. He asks the audience to donate a couple dollars, then he puts all the names of the staff working that night into a "hat" and draws a winner for the donations.
This particular night, the audience was especially generous. By the end, he had a huge wad of cash in his hand, including a couple of twenties! When he drew Greg's name as the winner, the man struggled to hold back tears. Bert asked him to tell the crowd why...