If you've ever seen a goldfish flip out of its bowl and on to the floor, then you've essentially already witnessed the infamous pool sex scene in Showgirls. In it, dancer Nomi (Elizabeth Berkley) impresses her boss Zack (Kyle MacLachlan) with her extreme flexibility, after he makes the first move under the waterfall, emerging like the Loch Ness Monster. Making the whole thing even more chuckle-inducing is the hideous pool decor, all neon palm trees and dolphin sculptures. If you were to inadvertently stumble upon these two in the act, you'd swear you were witnessing a deranged and/or distressed sea mammal.
1. Showgirls (1995)