Break break..
A few years ago while I was learning to fly I had the following conversation with the tower after joining the circuit.
G-KR: Final Golf Kilo Romeo.
Tower: Kilo-Romeo continue. Break Break. All traffic the tower is on fire and will be closing. Golf Kilo Romeo, you are cleared to land.
G-KR: Cleared land, Golf Kilo Romeo.
Tower: Kilo Romeo that's correct. Taxi your discretion, the tower will be closed. Break Break, All traffic the tower is now closed.
We could n't see any smoke and and the air traffic controller did not sound any different to the usual calm professionalism they excel at. It turned out it was just a monitor melting some insulation.