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Jake Gyllenhaal and Jimmy Fallon Play a Very Serious Game of ‘Water War’ (Video)

The classic card game, war, gets a lot more exciting when you get a glass of water thrown in your face for each hand you lose

Jimmy Fallon was dead serious in setting up an epic game of “Water War” with Jake Gyllenhaal. The “Nightcrawler” star and “Tonight Show” host squared off with five glasses of water and a deck of cards.

The classic card game war was raised to the next level, and promised a very wet ending in a short amount of time, with the water addition.

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The new rules state that every lost hand means a glass of water to the face. The first person to empty all five glasses not only wins, but they get to use the water cannon to finish off their opponent.

If, however, they actually go to “war” by matching their cards, the stakes are raised and the glass of water is replaced by a full pitcher.

“I’m pissing on your head, Jimmy,” Gyllenhaal said after one victory … which was even more awkward because he had just declared how strangely warm the water was.

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The guys got creative with the water dumps, winding up fully drenched before they were halfway done. But who won this very serious game? Watch the video above to find out.

Jake Gyllenhaal can be seen in Dan Gilroy’s “Nightcrawler,” in theaters Oct. 31. “The Tonight Show Starring Jimmy Fallon” airs weeknights at 11:35 p.m. ET on NBC.