The biggest WTF moment I had was when I was working for the local department of primary industries (government thing, for non-aussies). I was working a suburb that can best be described as er... an above ground sewer. Can't remember why my co-worker and I were there, but the person who answered the door of the property we have to work at was the biggest woman I've ever seen in my life.
Anyway, we're going through the spiel of what we need to do around the property, when someone from inside the house yells something out at at her. She cranes her head back, yells out a torrent of curses, and then it's on for young and old. The person inside is hollering out insults at a mile per minute, and she's giving em back just as much. After about 3 minutes of my co-worker and I looking at eachother trying to work out what to do, when she starts taking her clothes off.
Well, I say starts. It was more like she shed them in a matter of seconds. So now we're at the door, in government uniform, with a naked woman who's large enough to have her own gravity field screaming insults. It took us a moment, but when we realised she actually was starkers, we cut and ran back to the ute and took off.