To add some light reading:
SPG property in Europe - my room was given away during my active reservation. Key card didn't work and was given a new one without asking for ID to match the name on the room. Walked into my room and a couple had just finished the throws of passion. I stood there and pointed to my shoes on the floor and asked if they enjoyed themselves on my bed?
SPG property in Europe - on day of checkout but before checkout time, couldn't get into my room. They gave me a new key. Still couldn't get into my room. Manager came up and knocked hard on my door. Housekeeper was in the room with the door locked behind him. Very strange, nothing personal touched or missing.