I'm Thinking of a Sound
This School Readiness Activity provides early literacy thinking experiences for preschool children that will prepare them to do well in the early grades.
I'm Thinking of a Sound
>Playing with the sounds of words will help your child listen to sounds and words, and understand the importance of language.
What you need: 
Names of objects
What to do:
1. Say to your child, "I'm thinking of the sound sssss, as in sat. Can you tell me a word that begins with sssss?" Your child names one word. "Can you tell me another word that begins with sssss?"
2. Repeat this game using different sounds.
Source: America Reads Challenge: Read*Write*Now, America Reads