Scary Birthday to You! is a novella written by R. L. Stine. It was first published in 1999 and was the 39th book in the Give Yourself Goosebumps book series.
Description[]
Your birthday surprise is a weird entertainer who throws a "horror birthday." If you choose to open your presents, you're chased by crazed motorized toys, and if you choose to eat your cake, watch out -- it's crawling with bugs!