Bedlam
Etymology
A corruption of "Bethlem," short for the Bethlehem Royal Hospital (St. Mary of Bethlehem) in London, which by the 17th century was a notorious asylum synonymous with squalor and uproar. The hospital’s nickname became a common noun for any scene of madness and noise. The word carries the hospital’s grim history in its very sound.
noun · /BED-luhm/
A scene of uproar, chaos, and confusion.
What it names
For noisy disorder specifically — a place or moment where all control has broken down.
Example
When the fire alarm went off mid-exam, the hall descended into bedlam.
Related idea
Bedlam is chaos with an origin in a real place; pandemonium is chaos with an origin in an imagined one — both were coined from institutions of a sort, one earthly, one infernal.