perth again ....many years ago i was joining overhead at jandakot in aero commander vh-wam . tower asks 'any news regarding company aircraft mike alpha mike ? ' . experiencing a complete sense of humour failure i replied ' not aware of that aircraft' . tower asks again ' any news regarding company aircraft bravo alpha mike ? ' . a little confused now , still not getting it and wondering ' what the .... ' i replied ' not aware etc ' . only when given cnce to land with giggling in the background did the penny drop . taxying back by the tower a little 'porpoising' with the brakes produced more giggling from the ground guy .