Pete, that has to take the cake; absolutely the worst.

gnu, it was the foot-thru-the-floor one that I remembered.

So far I've miraculously missed any adventures with bugs or vermin in a hotel or motel. So far.

My worst experience related to service was in Barstow, CA., a few years back; don't remember the name of the motel, and don't know that I'll bother to look it up. The room itself was just another moderately crummy place that should have been cheaper; marginally usable internet connection, after fishing for an extension cord with an open socket to plug into. But breakfast was allegedly included. We went to the office/breakfast area and found...a transparent tupperware
container with a box of cereal inside. Absolutely, literally, zip nothing else there; no other food, no liquid, no dishes or untensils.
No staff, or anyone else, in sight. We went out and found breakfast. Came back to pack up and leave. Went to the office, still not a living soul in sight, "breakfast" still just the same.