Hoping it isn't on the FAA system, when a pilot in trouble needs help.
Pilot: "Pan pan, pan pan, pan pan."
ATC: "I can understand complete sentences. Please state the nature of your emergency."
Pilot: "We have suffered a cabin depressurization. I'm able to fly the aircraft but my co-pilot's oxygen mask is malfunctioning and he is suffering hypoxia and is incapacitated. We need to descend to a lower altitude so that my co-pilot can recover."
ATC: "In the cockpit, pilots have masks connected to pressurized oxygen tanks. These allow longer-duration use and continuous flow or pressure-demand delivery depending on altitude. Do you have any other questions?"
Pilot: "Crap, I know how the oxygen system works. We need to descend to a lower altitude, ASAP, please advise."
ATC: "It sounds like you would like to change to a higher altitude. If this is correct, say yes."
Pilot: NO!! That is not what I said!"
ATC: "I can understand complete sentences. Please state clearly why you are contacting ATC."
Pilot: "I already told you what the problem is!! "
ATC: "Ok, it sounds like you need to speak to a representative. So that we can direct your call to the right person, please state in a few sentences, why you need to speak to a representative."