So apparently there was an "Out of Order" sign on the restroom when I came in. When informed by a customer seeking use of a restroom, I confirmed functionality of the major fixtures and general cleanliness, and removed said sign. I figured that someone had short-stroked the flush handle again, sailed right past the sensible step 2 (same, only press harder) and went straight to step 3 (panic and inform guy making drinks). In fact, the reason was thus:
Someone had hot-boxed the restroom.
With crystal meth.