Make 'Em Jump Through Hoops

According to Wikipedia,

The soundtrack [to The Princess Bride] was originally released by Warner Bros. Records in 1987. It was written and recorded by Mark Knopfler of Dire Straits, the only person Rob Reiner felt could create a soundtrack to capture the film's quirky yet romantic nature. Reiner was an admirer of Knopfler's work but did not know him before working on the film – he sent the script to him hoping he would agree to score the movie. Knopfler agreed on one condition: that somewhere in the film Rob Reiner include the USS Coral Sea baseball cap he wore as Marty DiBergi in This is Spinal Tap. Reiner was unable to produce the original cap, but did include a similar cap in the grandson's room. Later Knopfler said he was joking.