Well, don't tell anyone, but I walked in on one of my employees and his girlfriend in the mood room spa late one night.
And a little less exciting - we have lots of customers on the coast. They tend to have trouble with surfers who get cold, as they sit there staring at a nice warm tub. It doesn't take long to figure out which houses have people in them full time and which ones are vacation or weekend homes.
And, I have been called to clean up commercial spas who had videotaped evidence of huge parties taking place in the spa - between 2:30 and 4 am. . .