Crews that use a hand held mike to get the clearance , giving me earache from the feed back.
Refusal to read back the QNH and merely repeating the ATIS letter (one guy did this 4 times before reading it back)
Crews that ask if I know what the order for departure is - when I am doing departures
Sadly the order that you get to the holding point does not confer the order for departure in the grand scheme!
And the usual - what's the reason for the delay - my reply - if it's blindingly obvious what the reason is, is a terse "traffic"!
But I have no problem if crews check a landing clearance - even if it is Mad Jock!
louby