As for odd things happening, how about a crewmember finding a pistol round (one shell, containing the bullet) in the empty overhead baggage space in the passenger cabin, soon after everybody has walked off of the plane? This was probably the airplane's third or fourth flight that day.
This happened recently right after one of my flights, and according to the gate agent who waited onboard for the TSA person to show up, no Federal Marshals had flown on it that day. Maybe a postal inspector (a Dirty Harry wannabe) had lost the round, but why was the thing loose, in the first place?