Best Episode to Show People Who Have Never Seen Glee?

None of my friends like Glee but I was able to convince them to watch only one episode and if they like it enough they will watch more. I need help finding THE BEST episode to show them. They know that the jokes/plots are .... interesting... so no need to worry about that since I've shown them some clips and there were some chuckles. Please help me find a good episode to please them and convince them it's a good show (if there are good song performances in the episode that would be a plus)!!!!!!!