Now for a bitta sanity.
Some time ago when ferrying an empty 744ER from Sydney to Melbourne, the F/O neglected to mention "Heavy" to the Tower approaching the holding point with traffic on about a 3 or 4 mile final.
A very Aussie accept replied "Qantas xxx are you heavy?" to which the F/O replied "ahh bugger, sorry forgot that."
TWR: "Nah Qantasxxx are you heavy?"
F/O: "No pretty light actually"
TWR: "In that case QFxxx clear for take-off."
Shortly after. "Yeah QFxxx ya must be light. Call Departures 1xx.x, Seeya"