 The penultimate episode, "The Anniversary", is about his efforts to put together a surprise anniversary party involving their closest friends.Things go wrong as Basil pretends the anniversary date doesn't remind him of anything though he pretends to have a stab at it by reeling off a list of random anniversaries, starting with the Battle of Agincourt, for which he receives a slap from Sybil, who becomes increasingly frustrated and angry.He continues guessing even after Sybil is out of earshot, and mentions other anniversaries (none of which happened on 17 April), including the Battle of Trafalgar and Yom Kippur, just to enhance the surprise.