If you were focused on the portaloos at the back, it was probably one ofthe guys in my office. He's been playing with it for ages now, and seems to giggle when people 'go to the bathroom'.
That controllable Texas construction site one really is amazing... I cna't leave it alone . Only problem is it uses up lots of my internets (restricted to 2GB per month starting on the 8th of the month). They could do with making it say 10 secs or 30 secs, not 1 sec.