Look at this ... it seems that Alison enjoyed some fun (rather a lot of fun, if you look at the video) with david the night before his eviction. Someone on the USA's BB4 posted this ....
''It was Ali's bed, but it didn't look like Nate. They switched the camera to a different bed. I switched to quad view to find them again, and the feeds went dead. When the feeds came back, in about two minutes, Dave was getting out of Ali's bed. He went to the bathroom, used some mouthwash and went to bed in his regular spot in the oasis room. As he passed Jack's bed, the camera focused on Jack, he opened one eye and went back to sleep. I was in a chat room during the "occurrence" and my fellow viewers were as puzzled as I. We all saw the same thing, but no one knows what we were seeing. I know if I was still working on a newspaper I'd be fired for writing a line like that, but that's the way it was. I have a really poor capture of it, there's no sound, but it was silent on the feeds too. You figure it out...
This was preceded by rhythmic motions under the covers in the HoH room. No one's sure what was going on there either. The difference seems to be that no one cares either. BB must be putting something in the water cooler, these people can't keep their hands off one another.''
Now Look At The Evidence.