Did we mention they were both wearing wigs of Efron’s 8th grade crimped hairstyle?

War is one of the simplest and yet simultaneously frustrating card games in existence.

It can be fun, but it can also go on forever.

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Credit: NBC

And this version came with a built-in time limit: each player had five glasses of water.

The first person to use all their glasses got to spray the other with a full-on water gun.

Fallon won the first round.

So good to see you, he said before throwing the first glass of water into Efrons face.

Anytime anyone asks that, just say, After you!'

Watch the clip below to see who won.