Sara is having one of those days. First she has a sock problem, and then there's a strange pea... All of a sudden, her Wobbler is out of control! What can Sara do on a day like today? Sara has a lot to learn about the ways of wobblers in this laugh-out-loud, bad-mood-banishing story from Nadia Shireen. Welsh adaptation by Endaf Griffiths.

Mae Sara yn cael diwrnod gwael. I ddechrau, roedd problem gyda'i hosan, yna roedd un bysen fach ryfedd ar ei phlât... Ac yn sydyn, daeth y Stranc i darfu arni! Beth all Sara ei wneud ar ddiwrnod fel hwn? Mae gan Sara lawer i'w ddysgu am stranciau yn y llyfr doniol hwn sy'n taclo hwyliau drwg, gan Nadia Shireen. Addasiad Cymraeg gan Endaf Griffiths.