Did you know there was originally going to be a scene where Timon and Pumbaa encounter Scar? Someone on the Lion King Wiki uploaded screenshots of the storyboards.
In an early draft of the film, there was some kind of plot-line about Timon and Pumbaa searching for Mufasa. In this scene, Timon and Pumbaa are wandering through the Elephant Graveyard (presumably after Be Prepared took place). They see the shadow of a lion and think it's Mufasa. They run after it and the lion turns out to be Scar. Timon says "You're not Mufasa", to which Scar says "Must I forever be reminded of this?!" The hyenas then attack them and they flee.
Here are the storyboards:
https://vignette.wikia.nocookie.net/lionking/images/8/8a/MustIForever%26Scar1.png/revision/latest?cb=20140127221902
https://vignette.wikia.nocookie.net/lionking/images/3/3d/MustIForever%26Scar.png/revision/latest?cb=20140127221933
https://vignette.wikia.nocookie.net/lionking/images/a/a8/MustIForever%26Scar2.png/revision/latest?cb=20140127222726