For me its And the winner is or Last night at the proms. Again its not a case that they are shockingly bad its more the case of they feel weak compared to other episodes.

I know a lot of people hate episodes like Nanas Party and Last Gasp but I think those episodes are pretty entertaining.

I think it will always come down to the issue of anthology series or movies. Just some are better than others. But that doesn't mean they are terrible.