Answer:
What goes trough your head but you forget it like 3 days after?
You fill it and it empties, A metaphor for plenty, Depending on what half you see, It's either full or empty
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?
I always run but never walk, I sometimes sing but cannot talk, No head on which a hat to place, You always look me in the face.
This is your stomach's way of letting you know you've neglected it.
I have feet on my head
Easy
Animal
Difficult
Food
Funny
Kids
Logic
What am I?