Apple made my boo boo

Kai cut his hand last weekend when he was playing in the yard.  He slide down the grass hill.  The cut is small.  All week has been about how apple made his boo boo.  We think when he was eating apples the juice went into the cut and that was when he first noticed it.  It is quite cute as he points to his hand and tells everyone a apple made my boo boo or just apple boo boo.