"I hope that's not a hostage"

Yes, I'm watching Die Hard again. It's a film full of lessons.

• Hollering while shooting really improves your accuracy.
• While you were shooting up Vietnam, your coworker may have been in junior high.
• Double-crosses have a high rate of blowing up on you.
• We can all do our part, even if it's driving a limo into an ambulance.
• The same traits that make you a hero can make you very hard to live with.

What else have you learned from this classic?