It's a matter of a pinion(http://www.merriam-webster.com/dictionary/pinion).
Batman can go to the store without robin Edit: glad you'll liked it
One is against the law and the other is sick bird.
A walk.
Two chickens and a goat.
Birds of prey!
Because there's more birds in it.
What's the matter You look flushed!
None, cuz in the end it doesn't even matter!!!