Yippee Ki-Yay Motherf*cker!: A Trivia Guide to Die Hard

"Come out to the coast, we'll get together, have a few laughs."

That line, one of many quotable moments from Die Hard, was an on the spot insertion during filming by actor Bruce Willis and director John McTiernan. That's just one of numerous ad lib or almost accidental elements added to the film which make it such a memorable modern classic.

When Die Hard premiered in July 1988 John McClane didn't just become a fly in Hans Gruber's ointment, he heralded in a new era of action movies, inspired...