Ditto what others said about disagreeing in front of small kids. But I suspect that once kids are older it might be useful to have "staged" disagreements about things in front of them (ie: one parent can "convince" the other about why child should not be allowed out past 10, drink alcohol, go to a sleepover, whatever)

Hmmm, maybe in theory it sounds good - I would love to see if it works though LOL!