1. Let's start at the very beginning, when Meredith learned she had slept with her new boss Derek. ABC TBT to simpler times. 2. And then when Addison showed up, revealing that she was Derek's wife. ABC Meredith's face says it ALL. 3. The infamous train wreck that caused two strangers to be stuck together by a pole. ABC 4. When Meredith had her hand on a bomb inside a patient...and then the bomb exploded. ABC 5. When Izzie convinced Denny it was a good idea to cut his LVAD wire in order for him to get on the donor list for a new heart. ABC 6. And then when Denny died after everyone thought he was going to be okay. Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF ABC 7. When Lexie showed up and revealed that she was Meredith's younger sister. ABC 8. Just everything about the active shooter in Seattle Grace Hospital. ABC 9. The patient that sawed off his own foot because he was convinced it wasn't actually his foot. ABC Halloween on Grey's Anatomy is just next level. 10. When someone's pet lion got out and mauled several patients. ABC 11. Of course, when Izzie began seeing ghost Denny...and had sex with him. ABC Still the weirdest thing to ever happen on this show. 12. When Izzie learned the reason she was seeing Denny was because she actually had cancer. ABC 13. The patient who was encased in concrete because his friends dared him to jump in it. ABC 14. When Lexie had to help a patient whose carotid artery literally burst while they were talking. ABC 15. When Meredith drowned after the ferry boat crash and the entire team successfully brought her back to life. ABC The first time we knew Shonda didn't play around and would possibly kill the main character. 16. When George and Alex had to operate on a patient while they were trapped inside an elevator. ABC 17. When Burke left Cristina at the altar and Meredith had to cut her out of her wedding dress. ABC 18. When George discovered he caught syphilis from Alex after Alex slept with his girlfriend. ABC 19. When Meredith's mom Ellis was unexpectedly admitted into the ER and her lucidity floored everyone! Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF ABC 20. When George failed his intern exams and had to repeat being an intern. ABC 21. When Cristina was stabbed by a falling icicle after telling Meredith her and Derek's relationship will never work. ABC 22. When Meredith was brutally attacked by a patient and had to have her jaw wired shut. ABC 23. When Henry died on Cristina's operating table...and she didn't even know. Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF ABC 24. When most of the team was involved in a fatal plane crash that ended up killing Lexie and Mark. ABC 25. When Cristina decided to take another job and left Seattle Grace and Meredith. ABC 26. When Maggie arrived and was revealed to be Ellis and Richard's child. ABC Meredith had no siblings when this show started, then all of a sudden gained three: Maggie, Molly, and Lexie. 27. When Derek died after saving an entire family from a horrible car crash. ABC 28. When we found out Jo was actually married and "Jo" wasn't even her real name. ABC 29. When Ben decided it was a good idea to operate on a pregnant mother in the hallway while the hospital was on lockdown. ABC 30. When Callie started dating Penny, one of the doctors that was partially responsible for Derek's death. ABC 31. When Owen's sister Megan was found alive after everyone thought she was dead for several years. ABC 32. When Stephanie was trapped inside the burning hospital with a young patient. ABC 33. And finally, when we learned that the bus crash victim "John Doe" was actually George. ABC A moment we will NEVER be over TBH. Don't see your favorite OMG moment from Grey's Anatomy here? Tell us your fav in the comments below!