Here is my 'Murphy was an A-hole' quick story:
19XX, and Qual-Testing Lab Viking Labs, Cupertino, CA. They provided (aviation) quality and environmental testing. Environmental in this sense meaning hot/cold vacume and vibration, for aviation standards.
Vibration 'table' was this big, 1.5 meter cubed 'Voice Coil' very much like in a very large loudspeaker.
Plus, our little new product box, just a couple ICs plus some aircraft style mech. relays, would ALSO need to do a soak, in an OVEN attachment, to that vibration test box.
Needs all 3 axis, in something like 3 hours (vibration under heat) each axis.
Well, "There's no need to bring enough CASH, for hotel tonight...the thing has made it this far" (2 axis tested, one to go).
Readers, you can probably guess the ending The internal mechanical 28 V relay FAILED, at hour #2...
Not close enough for bribery or other subterfuge.
Calls to the BOSS at home (10 pm), got out of there (Viking Labs) at past 3 am (no hotel).
Our WHOLE factory line was impacted, bad. Double shifts and other 'crisis' conditions.
Lesson learned:
Carry or hide some cash, when on business related trips...(No nearby relatives to help out).