The episode where Joey finds his identical hand twin has to be one of the worst. I'm all for a bit of light hearted sit-com nonsense however this was just daft. He was so excited about it, was going to make his fortune etc but never really established how one would make their fortune by finding someone with similar looking hands!
I know it was Joey and he was quite child-like in ways but there were episodes where he was made to look like a total idiot. The one where he spoke French comes to mind too.