We had a KLM uk pilot radio us up on the G/A 15 minutes after departure questioning the loadsheet...He asked furiously"what is the /12 after the flight number on the loadsheet"! ( Thinking that we had made an error )
We replied " well that would be the date sir" (trying not to laugh).
"Er....oh..yes ok thanks" he replied as most of the servisair stations in a 200 mile radius would have probably heard his side of the conversation..