I LOVE THAT SHOW!
My friend and I always impersonate Colin and Ryan (I'm Ryan because I'm shorter and we love irony). My theatre friends and I also play the improv. games all the time. Our favorite is to begin playing Questions when your in a large group such as at a party, but don't tell anyone else that your playing Questions.
My favorite game to watch is Greatest Hits, Hoe Down, Irish Drinking Song, Props, or Scenes from a Hat
My favorite game to play is Translations (I'm not sure if that's what it's called but it's where they have two people speak in a different language and the other two are their translators), Irish Drinking Song, or Scenes from a Hat.
I have trouble picking favorites...