Danny and Valerie: Handcuffed together
This seems to be a spoof off of an old movie made by Alfred Hitchcock in the 1950s or 1940s called The 39 Steps. In the movie, a man and a woman who had grown a mutual hatred for each other became handcuffed together somewhere in the middle of the Scottish countryside. Throughout the majority of the movie, they were on the run from two spies who were out to kill them (similar to Skulker), all the while handcuffed together. This experience also sparked a slight romance between the two of them, who had previously strongly disliked each other, just like it had through this episode and the upcoming episode, "Flirting With Disaster."