Author: Anne Fine; Welsh Adaptation: Gareth F. Williams.

Series: Cyfres Pwsi Beryglus.

Okay, okay. So spank my furry little bum. I held a party. It was my birthday. How was I supposed to know it wouldn't be the only party around town on that dark and dreary Halloween night? So things ended up in a bit of a mess. (Well, more than a mess, really. A complete disaster.) But it was not my fault so don't blame me . . .

Awdur: Anne Fine; Addasiad Cymraeg: Gareth F. Williams.

Cyfres: Cyfres Pwsi Beryglus.

'Ocê, Ocê! Rhowch slap i mi ar draws fy nhintws bach blewog. Mi wnes i gynnal parti - un arswydus iawn.' Mae'n 31 Hydref - noson Calan Gaeaf - ac mae'n ben-blwydd Twffyn hefyd. Beth am gael parti i'r gath, felly? Na, mae'n well gan rieni Elin ddathlu Calan Gaeaf. Dyma benderfyniad y byddan nhw'n ei ddifaru wrth i'r bwsi beryglus a'i ffrindiau gynnal eu parti eu hunain.