My contributions.
Heard on the Oslo 120.375. A N-reg 777 is about to get it's oceanic clearance or similar. Can't remember its callsign, but lets call it "american"
Oslo: "American 123, confirm you are RVSM approved?"
short pause
American: "yes ma'am"
Oslo: "American 123, confirm you are bla bla bla approved?"
slightly longer pause
American: "ah, yes ma'am, we are"
Oslo: "Ok American 123, confirm you are more bla bla bla approved?"
quite a long pause.
American (apparantly fed up with looking into what they are approved for and not): "Look ma'am, were a brand spankin' new 777 straight out of the factory, we're approved for everything!"
Heard during my initial training:
In Sweden the letters are pronounced as first names, much like M is Mike and J i Juliet. This goes for the whole alphabet. The student is only slightly aware of this and hasn't learnt the system quite yet. To translate the joke, lets say the callsign is MJ.
"XXXXXX Radio, Mike Johnsson, left downwind RWY 24".
Instructor looks puzzled at the studen and asks, "why did you say Johnsson? It should be juliet".
Student replies: "Well sir, I thought Mike should have a surname!"
Also during training:
TWR: "S-KS, extend downwind".
L-KS: "extending the runway, S-KS"
/LnS