Is it possible for someone to awaken the Mangekyou Sharingan before they even awaken the Sharingan? I was just wondering if it was possible for an Uchiha to awaken the Mangekyou Sharingan before even awakening the Sharingan.

According to wiki:


  It (Mangekyou Sharingan) is initially awakened by the trauma suffered from witnessing the death of someone close to the user.


I think it should be common sense by now, but if you didn't know then to awaken the MS the user has to witness something so traumatic, like seeing someone close to the said user die.

According to wiki:


  When a wielder of this kekkei genkai experiences a powerful emotional condition with regards to a person precious to them, their brain releases a special form of chakra that affects the optic nerves, transforming the eyes into Sharingan.


To awaken the Sharingan, an Uchiha has to have an extreme(powerful) emotion condition which causes their brain to release a special type of chakra, which will then cause their eyes to transform into Sharingan.

I have put the way the Uchiha awaken the Sharingan and the MS, but could it be possible to combine both of the said ways into one? What I mean is if an Uchiha, who hasn't awakened the Sharingan yet, witnessed something so traumatic they just awaked the MS. Could that even be possible? Or would it just awaken the Sharingan and then the MS almost instantly at the same time?
To be honest, I believe the death of the whole clan (especially the death of someone's parents by one of their own siblings - Itachi) is more traumatic than anything and when Sasuke with all those emotions could never achieve it in such a long time, I am sure it can not be achieved without achieving the basic Sharingan levels.

And most importantly, you can not simply do a maths questions without knowing the basics... So basics, i.e Sharingan must be present before the awakening of Mangekyou :)

That is simply what I believe, what is in the minds of Masashi, we don't know :P