I took one camera out with me, a Mamiya 7II loaded with film expired in 1964. I even metered this shot. 3 months and 9 shots later I took it to two London labs, both had no idea what chemicals to dev it in. One of them tried B&W, and pulled the film early as not to melt the emulsion off. Out of an entire roll, only one shot came out, the very first frame on the roll.
A man backstage, passed out, with an umbrella up his bum.