Poohead,
I also called the guys in the tower later and they said they were in the tower at the time and watched the entire show. Not one of my finest hours.
Maybe not your finest hour but they would have laughed their arses off and it would have made their day.
We used to try and activate it on LIGHT setting, as the AMBO crossed it during newbies airfield driver training (Radio activated ones that is).
For any others who might care, the "Bird Bath" has a more technical description in ERSA. It is known as the "AWF" or, Aircraft Wash Facility.
Lock it into the grey matter it folkes, it might win you a trivia contest one night.