Jurassic Park is one of the greatest films ever made. There is no question about that, and even more than 20 years after its initial release, fans are still clamoring to learn everything they can about the movie and its sequels.

Lucky for you, we’ve compiled 13 of the rarest bits of trivia about the series!

1. The T-Rex roar was actually produced by recording Steven Spielberg as he yelled at an intern to bring him coffee. This was then slowed down 500% and played backwards.

2. The velociraptor that fogs up the glass of the kitchen door was actually played by Gary Oldman. He truly disappears into his roles.

3. A combination of practical and CGI effects were used to make it look like Wayne Knight was able to get out of his chair.

4. The scene in Jurassic Park where Tim is electrocuted by the fence was actually the last one shot for the film. This allowed the filmmakers to actually electrocute the child without fear of needing to recast for other scenes.

5. In real life, the mom and baby T-Rex’s from The Lost World were actually brother and sister.

6. The dilophosaurus spit was created by mixing K-Y Jelly, food coloring, and the ground-up bone marrow of the grip who accidentally parked in Spielberg’s spot.

7. The famous Ian Malcolm line, “Life finds a way” featured a prominent “Uhhh” because Jeff Goldblum forgot the actual line on set and started ad-libbing halfway through. The script originally read, “Life will absolutely not find a way, and I think this park is destined for great things.”

8. Jurassic World was originally going to be called Jurassic Out of This World and take place in space.

9. There are no “dino dongs” in any of the Jurassic Park movies.

10. PETA protested the original Jurassic Park because the T-Rex separated its shoulder filming the jeep-chasing scene.

11. If you look closely in the background of the kitchen scene in Jurassic Park, you can clearly see that someone left the stove on, indicating that even if the dinosaurs had not escaped, the park was doomed for failure.

12. There is a little-seen direct-to-DVD Jurassic Park sequel called You’re Tearing My Jurassic World Apart, and it documents the tumultuous end of the relationship between Dr. Grant and Dr. Sattler.

13. In total, there were only 17 combined dinosaur-related deaths on the sets of all four movies in the series.