Me and a mate went to Lisbon for a long weekend. The first evening, we had a skinful, and then called it a night.
The following morning, he phones me in my room to tell me that he hid his wallet when he got back to the room the previous night. Problem is, he can't find it. He's convinced he hid it under the mattress, but it's not there.
We pulled the room apart, but could not find the wallet. To this day, he maintains somebody came into the room while he was sleeping and nicked it!
Fortunately, he'd 'hidden' his passport in the safe whilst he was sober...