Not strictly ATC but heard this conversation between 2 Quantas F/C and small Thai dispatcher at the newly opened Bangkok airport walking down depp gates. "So we have been to gate XX and gate XX and now gate XX with no 777 on any of them let alone a Quantas one. Have you any idea where you have put my aircraft !" Made me smile as I was playing hunt the EK lounge with one of the Thai airport staff at the time, who also seemed unaware of where that was as well !.
