While listening to the approach frequency to LAX (Runway 25L), I heard an airliner report a party balloon at 600 feet during his approach on the ILS. The tower proceeded to report the balloon to the aircraft following. While doing so (and clearing another airliner to land), this communication took place:
"Los Angeles Tower, Airliner 123 at LIMMA for 25L."
"Airliner 123, Los Angeles Tower. Caution: wake turbulence; following a heavy 757 on short final. Aircraft reported a party balloon at 600 feet."
"A what at 600 feet?"
"A party balloon."
"O.K. W'ell be ready to party at 600 feet. Airliner 123."