One that bugs me is:
ATC:
XXX123 descend flight level two five zero.
XXX123:
123, roger, re-cleared two five zero (sic), and ah do you want us to leave now?
ATC thinks but doesn't transmit:
No, tomorrow morning will do fine 
Hey guys & gals, when descent is given without any option in the clearance it means NOW. So don't waste my time asking
