I was a teenager and I worked at a theater when Under Siege came out and we watched that movie probably 500 times. Well, that part of that movie at least. We had it timed so perfectly. At that time there were 7 minutes of previews, a 30 second "thank you for choosing our theater" bullshit thing, and then the movie would start. At 51 minutes after lights out (around 43 minutes into the actual movie) that's the topless scene where she pops out of the cake. Around 49-50 minutes after lights out almost all the guys (and even some of the girls) found a reason to be in the theater.
It got so bad that our manager Karen (yes, really) had to pull us all to side and tell us to knock it off and that no more than 3 people could be in a theater at a time.