You Never Ask A Horse For Hay.
Just Think About It. Its pretty much asking somebody/something to do something that you know they can do but they say no just to be an asshole.
Vinni: Hey frankee! Can you edit this video for me because you edit sooooooo gooooood!!
Frankee (God Tier Video Editor) : No. Fuck you. You never ask a horse for hay.
Frankee (God Tier Video Editor) : No. Fuck you. You never ask a horse for hay.