Outbound on a training flight and listening to the tower freq., heard on the radio
Plane "I'm squawking 7700, and calling tower, MAYDAY MAYDAY MAYDAY Cessna 32324 declaring an emergency turning back towards the airport."
Tower "Cessna 32324 copy your emergency cleared to land 32R, do you need any emergency services and how many souls aboard?"
Long pause
instructor gets on "Tower sorry about that, we were supposed to be simulating"
The cessna was practicing a emergency, Cessna didnt have a stuck mic the student was just holding it when he got excited.