Bobby likes Jimmy but not Joe,
apples but not pears,
jeeps but not vans,
shinny but not hockey,
tennis but not squash.
Who will he like, Sara or Sally?
Sally, he likes everything with double letters.
Why this works
This riddle plays with the concept of double letters in words. Bobby likes names and items that contain repeated letters: "Jimmy" has two 'm's, "apples" has two 'p's, "jeeps" has two 'e's, "shinny" has two 'n's, and "tennis" has two 'n's as well. Therefore, when presented with the choices "Sara" and "Sally," we see that "Sally" contains the double 'l', making her the one Bobby likes!