I've always had a soft spot for Robert Earl Keen and Pat Green.
I was social chair of my fraternity one semester and we had an annual country themed party called the OK Corral. I wanted to get Robert Earl because I saw him play a few times at other parties and he would have definitely been the biggest draw (ie, tons of hot pussy) but he was booked for a show in Dallas that night. His agent recommended Pat as they had similar sound, so I booked Pat. He had only playing parties for about 6 months, mainly smaller gigs, and nobody had heard of him so we didn't really know what to expect. He put on a really great show and stuck around the house drinking for a few hours after the party. Fun times.