Plot It Yourself by Rex Stout

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I stopped because he was having a fit. He had closed his right hand to make a fist and was hitting the desk with it, and he was bellowing. He was roaring something in a language that was probably the one he had used as a boy in Montenegro, the one that he and Marko Vukcic had sometimes talked.
Fritz, entering with beer, stopped and looked at me reproachfully. Wolfe quit bellowing as abruptly as he had started, glared at Fritz, and said coldly, "Take that back. I don't want it."

"But it will do – "

"Take it back. I shall drink no beer until I get my fingers around the creature's throat."