I watched the movie the night before so I could concentrate on the riffs (not that it helped with many of them being drowned out by the movie), what they did with the shower scene was probably way more funny than doing any kind of riffing. That scene is a bunch of people in the shower just saying why they joined the military. Without the boobs and butts it would be the most boring scene in the movie.
Agree with Mrs. Dick, the RAID! line was a great, and Mike's "my wedding vows" line was a killer, his delivery there was perfect.