<human>: Can you provide a brief rundown of the text in within 3 sentences?

So, my buddy (J) and I hang out all the time and we try to troll each other as often as we can. He used to be real big into playing Magic the Gathering with his other friends and after months of convincing, finally got me to play the game. To tell you the truth, I actually enjoyed it and found to be an extremely rewarding/fun game, however, after seeing the hours and money wasted on this game by J I realized that I shouldn't play anymore as my wife would be upset at this particular hobby.

So, flash forward months later, at work J begins telling my boss and coworkers that I was a Magic the Gathering ringleader just to troll me. As he is my senior they were inclined to believe him even while I protested. He denied any involvment which completely, and utterly, baffled me. I then went to my cave and went to work on some petty revenge. 

I've never messed with photo shop before but I spent hours conjuring up a beautiful picture of his face on a Magic champion with the 2nd and 3rd place finishers in the background. It looked good. I made up a backstory about his triumphs with his two buddies in the picture. 

Strolling into work I told him that I had evidence in his involvement. He believed me and offered to sign a document stating his trials and tribulations in the Magic universe if I would not put forth any more evidence. I agreed, little did he know I had already placed the picture on a coworkers desk. 

Now I have a signed document of his involvement and the photoshopped pic of him. Everyone sees it all and ribs him for it. It has now become a running joke around the work area of his Magic triumphs. The picture has now been combined with the signed document and is now laminated on our boss' desk for all to see. 

It was a triumph and he now knows his place! Sweet petty revenge.
<bot>: Man accuses me of playing Magic at work. I generate evidence disclosing his involvement, he has now become the butt end of numerous jokes.