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A big thanks to Mashable for tipping us off on the hilarious videos below from Improv Everywhere.

When you’re on a New York subway, you never know who you might run into…even storm troopers.

(The second video below is even funnier.)

The last time I went to the library, I wasn’t thinking of Ghosts, but these people probably won’t go again without thinking about spooks, but don’t worry, you know who to call if it happens to you…

I wondered about the security guard that talked to the first ghost, and those ray guns could have gotten those guys shot or in trouble. However, the idea for the stunt came from an unlikely source. According to Mashable:

The NYPL is currently dealing with some serious budget cuts, so they approached Improv Everywhere (of Pantless Subway Ride fame) to draw attention to the building’s plight.

Pretty cool.