Why did the student get kicked out of the library?

This joke plays on a classic bit of wordplay, taking a common idiom and twisting it into a literal (and very disruptive) action. The humor comes from the pun on "pulling out all the stops." In everyday language, this phrase means to use every bit of effort or resource available to achieve a goal, often implying a grand or even noisy endeavor. Think of someone going all out for a big presentation or a sports team giving it their absolute all.

However, the "stops" in the idiom actually refer to the physical stops on a pipe organ. These are levers or knobs that organists pull out to control which sets of pipes sound, thus changing the instrument's tone and volume. Imagine someone literally pulling out all of these stops in a library – the resulting blast of sound would be anything but quiet and certainly grounds for expulsion! The joke cleverly juxtaposes the quiet sanctity of a library with the potential for a massive, organ-induced ruckus, all thanks to a single phrase.