If I ever stage a wedding again, I want Vince Vaughn and Owen Wilson as guests. They are not only the perfect wedding guests, crashers or not, they are incredibly funny--especially Vaughn. This is a fairly brainless movie, but clever and intelligent enough to make you stick with it. Vaughn's timing is wonderful. The first half--establishing the plot, so to speak, is the best, but there are plenty of high points in the second half--particularly provided by Christopher Walken and Jane Seymour. No redeeming social value: HOORAY!