I was speaking with an old friend of mine who has many thousands of hours flying 707's for Qantas (amongst many other aircraft - he has accumulated 22,000 flying hours total!). Here's a great short story he told me:
Long night flights over the Pacific tended to be boring. In the centre of the control column was a removable clip-on cap which said 'Boeing'. We had an un-written tradition where people would remove the cap, write a message inside, and then replace it.
At some stage to break the boredom of the long international flights, you would remove the cap to find the latest message.
It could be the state of the pay negotiations, some girl's phone number etc. The one I liked best was a bible reference which read "Hebrews 13:8" - and nothing more.
When we finally arrived at the hotel I opened the bedside table draw and found the usual complimentary bible, so I looked up the Hebrews verse. It read:
"Jesus Christ; the same yesterday, and today, and forever". It just goes to show how bored some might have been with their rosters!
This sticker available here.