If the war calls for Warhols
Hope you got enough space on your hall's walls
Continuing the play on being “forced to draw,” Jay’s saying that if circumstances dictate drawing weapons, he hopes for your sake you have the necessary capacity (i.e. gun power) to go to war (as having enough space on your walls would be required if you needed a bunch of Warhol paintings). Also, there is a play on the word “war”, which is a common card game, involving a nearly endless series of “draws” from a deck.
Warhols, of course, are highly in demand and fabulously expensive. A self-portrait sold for $32.6 million in 2010.
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