I told you to go right

Don't try to stop me, you fucking stranger.
On the contrary, Mr Mustang. I don't think your...friends would notice this elaborate suicide and homicide.
Who the hell are you? You sound like the G-
Who I am is of no concern to you. Your only concern should be the plans we have had for a long time that involve you...
Celestia, who the fuck is this joker? Celestia? Celestia, you there?
Right now, we are the only people in your...eccentric mind. Bear in mind that we have been observing every one of your moves.
You're the G-Stallion...?
If you were to put it in such a crude way, I am. Would you like to know anything else before we start, Mr Mustang?
Two things; did you make me go insane, and who do you work for?
I work for a group that has been...protecting you and your companions from death and danger. We have big plans for you, so the risk of you slipping away is too great. To answer the first question, no. We can find no possible reason for you to have snapped right then, so it can be assumed you've gone insane.
Right...so what do you want?
As stated, you are part of our greatest plan. To bring about the return of chaos. The return of insanity. The return of Lord Discord.
Well, I've already brought insanity to Equestria when I first arrived, so he's kind of late.
Ooooh, I'm late to the party, that's a shame.
Are you...Discord, by any chance?
Finally, somebody other than these CULTISTS that recognises my gorgeous face.
Did you send me here? From my home, to Equestria?
No, that was NOT me, I do not waste my time with such petty things. And, in case you didn't know, I'm a statue right now. I can't actually do anything, besides dream of chaos...
Huh...any idea who MIGHT have sent me here? I've already asked Moony...
Moony?! That's her name these days?! Oh, that's a good one.
No, her name these days is Princess Luna. She just decided to be a bitch so I stopped speaking with her.
As you can see, Mr Mustang, Lord Discord cannot be brought back without first having a chip in his stone imprisonment. That slight dent, caused by you, can bring about a new age of madness. You would be the legend.
But how am I going to do it? The Princesses and I aren't exactly 'buddies' right now, so getting into Canterlot without being arrested will be impossible.
Of course; that is if they could see you going in.
What, so you're gonna make me invisible? Like a ninjaaaaa?
No, our plan simply consists of you climbing to the top of the peak, before diving down with a chisel to break the casing. A small indentation in a wall could cause its collapse, if placed correctly.
Ok, I've heard enough. I'll help, but on one condition.
And such a term might be?
That I can assist in the ensuing carnage.
Aaaaah, I knew this guy would help! Such a bucket of chocolate milk he is! Hahaaaaaaa! I shall see you when the chiselling takes place.
Very well. Send me more details later.
Well, before I go, would you like assistance with escaping your suicide?
Certainly. Might you be able to get me into Celestia's quarters? I have a bone to pick with her, and her sister.

Very well. Just wake up, Mr Mustang. Wake up, and smell the ashes.

The image of the G-Stallion faded, and as he faded I was assertive I definitely wasn't in my room. Lavishly decorated pillars towered to the roof, there was a perfect white marble floor, and just across the room stood the target of my rage. Celestia was stood, facing away from me and...crying? I stepped forward quietly. I managed to get all the way to being right beside her, until I sighed.
"I'm not dead, Celestia." My voice caused her to immediately look in surprise, a shocked expression on her face. She remained this way, before sniffing away tears and looking away.
"Yes, you are." she whispered. "I heard the gunshot. You've just come to taunt me. Go back through the wall you came through."
"Nope.avi." I replied calmly. "If I were a ghost, it would be impossible for me to have feelings. And ghosts come back to haunt the places they had a strong emotional attachment to: I have no attachment to your bedroom." Celestia looked down at me again, blinking away tears. "If I were a ghost, I wouldn't have come here to...you know...apologize. Ghosts keep their same emotions they had before death, and their opinions never change on what they loved, hated, liked, and detested. Right now I only have guilt for lying to you."
"Lying?" asked the Princess.
"Yes." I paused. "The timer wasn't connected to anything other than the rifle. It fired harmlessly into the floor. I'm still alive, your pupil is still alive, they're all still alive." Just before I could explain anything else, I was pulled into a crushing nuzzle-hug thing.
"Don't ever do that again." Celestia said quickly. I felt tears going down my neck, probably hers. "Luna...she'd be heartbroken."
"She wouldn't." I grunted, forcing my way out of the nuzzle thing. (Huzzle? Nah, that sounds like another word for gang rape.)
"Well, of course she would be. Oh, you're referring to your falling out?" Celestia turned and sighed. "She's locked herself in her chambers, she won't speak to anypony, not even me. You really changed her over the year."
"Well, she won't want to speak to me if even you thought I was a ghost." I snorted, and began walking towards the balcony edge. Just as I spread my wings and prepared to leave, Celestia piped up.
"But...it's worth a shot at speaking to her, right?" Celestia asked. I stopped to consider this. Wouldn't hurt to try...unless she throws me at a wall.
"...alright, I'll try." I sighed, folding my wings as Celestia escorted me towards the door. I paused again. "And Princess? Thank you. For giving me another chance." Celestia smiled, and rubbed a hoof in my mane.
"Well, what would I do without you and your friends? You're all like brothers to me."