Here is a slow-mo video of a scientist making a duck have sex with corkscrew-shaped beakers. It is one of the craziest things I've ever seen. Merry Christmas!
You're going to want to check out Carl Zimmer's full article about what exactly is going on here. Essentially, evolution has caused duck penises and duck vaginas to adapt into pretty wild and complex contraptions, with the penises unfurling into clockwise corkscrew shapes while the vaginas have evolved into counter-clockwise passageways with multiple pockets. And you thought your vagina was impressive!
Seriously, go check out the article to give this video some context. If nothing else, it'll provide you with a deeply inappropriate anecdote to tell your extended family over dinner tonight. [Discover Magazine]