While at Harvard, Conan O’Brien stole the original Robin costume and held it hostage for a few days!

In 1984, Conan O’Brien played a pretty funny practical joke at Harvard. Two classmates convinced Burt Ward, the actor who played Robin, to speak on campus. O’Brien and friends dressed up as security guards to “guard the Robin costume” that Ward had brought for the lecture.

During the lecture, they cut the lights and a friend dressed in the Penguin suit ran on stage and stole the Robin costume. They held it hostage for a few days while negotiating with Ward before returning it.

(Source)