Some believed the real “trick” was the student body:

[tweet https://twitter.com/StevenSarbey/statuses/395978282841030656]

[tweet https://twitter.com/StankyHenky/statuses/395918189638320128]

While others enjoyed their Halloween festivities:

[tweet https://twitter.com/ADCDance/statuses/396018292302700544]

#olin #wustl #Halloween http://t.co/tV8BcsAUOG

— Vasily Kuznetsov (@DarkVasyaK) October 30, 2013

And of course, there numerous campus sightings of Pac-Man chased by a ghost:

Why is there a ghost chasing pacman on washu campus?

— Kawana Tharps (@top6ecret) October 31, 2013

Happy Halloween from wash u pic.twitter.com/1dbjbUDc7K

— Sarah Ruthen (@sarah_ruthen) October 31, 2013

Lol #WASHU pic.twitter.com/A8RFuEybHy

— Jess Walia (@musicislyf3) October 31, 2013

Pacman at wustl #wustl #spottedatwashu pic.twitter.com/kCHblEN2LE

— A$AP CHEESE (@therealKBalla) October 31, 2013

nerdy wustl #halloween http://t.co/hNcjCsxKWq pic.twitter.com/OZ4FSCfWTa

— Julia Bernstein (@jaybeebern) October 31, 2013