Kochanski returns to her cell and discovers Kryten has attempted to celebrate her period with a banner that reads 'Have A Fantastic Period' as well as giving her a gift-wrapped tampon and encouraging her to try it on and give it a twirl. Kochanski makes Kryten realise he's been tricked.
Kochanski discovers Kryten's attempt to celebrate her period with a playful, albeit misguided gesture. This highlights a difference in understanding of social norms and expectations between humans and androids.