Click to see Spoiler:
I think that Karl, (Pam's husband) is going to snap and try to kill Bill. Remember how all season, he's been depressed. He got upset with Bill when protestors, trashed his yard, then Margene came between he and his wife, then they showed him looking at the wedding guests arriving next door, while he's all depressed about being unemployed. I think they are building him up to snap.