Advert-Interesting, but I don't really see how the buffalos would make him want to hurt Mufasa?

Here's my personal theory:

Well maybe Sarabi and him were hanging out and Sarabi nuzzled him and Mufasa was depressed, And so Ahadi cared Dearly for Mufasa and had and argument with Scar/Taka. The day after Scar scampered into the savannah and wasn't aware that there was a Buffalo stampede and as he tried to escape the stampede accidently scarred him and ever since Scar returned back he plotted that is how Mufasa shall die.

Both interesting theories.
Mogo-I think the father one's the most common, but interesting idea about the mad hyena^^
Winkle-Great idea...

Personal theory? Well, in order to impress the trio of hyenas who later become his followers, he challenges their leader, who is strong and unlikely to be beaten. He earns the scar in the battle, and, because of his courage, Shenzi, Banzai and Ed become his pals.

These are my theory's about who scared him

1. his father got mad with him over a small thing he done wrong
2. a Mad rouge hyena was in a bad mood and swiped at anything he could find
3.Him and his older brother where play frighting as cubs and one of mufasa's claws was pointing out When acidentally scratched his face