The earliest known usage of the "It will fluctuate" punchline is not by J.P. Morgan but by John D. Rockefeller as recounted by Henry Poor, post mortem, in the Wall Street Journal, Oct. 1922.
From Reuters via CNBC:
Oil prices extended gains on Wednesday after the U.S. government reported crude stocks rose last week, but gasoline and distillate inventories fell.
The Energy Information Administration said U.S. commercial crude inventories rose by 3.4 million barrels to a total of 480 million barrels in the previous week.
Crude stocks at the Cushing, Oklahoma, delivery hub fell by 785,000 barrels, EIA said.
Gasoline stocks fell by 1.1 million barrels, compared with analysts' expectations in a Reuters poll for a 817,000 barrels drop.
Distillate stockpiles, which include diesel and heating oil, fell by 3 million barrels, versus expectations for a 1.7 million barrels drop, the EIA data showed....MORE