I am looking to find which episode talks about Rick who has to decide between Magnum and T.C. about which one has to be the "witness" for his wedding. He decides about T.C. and Magnum laughs about it....
That would be the finale episode "Resolutions". Magnum is busy running around trying to wrap his life up and Rick has a difficult time to get TM to stop and slow down so he can tell him that TC is going to be his Best Man.