Yeah, you shouldn't watch the video while you're at the office. Because if you're anything like me, someone who laughs easily, you'd laughing out loud in no time.
I think I like Jeff's story better than Jane. I'm not sure if the story I read of Jane was the original one because creepypasta deleted her story and I had to go look for it somewhere else. :P
Jeff's story? Hrmm... His family moved into a suburban neighborhood and three kids, who were bullies, wanted the lunch money of Jeff and his brother. Jeff attacked the bullies and he even stabbed one of the kids with the knife that a bully had with him. When the police went to Jeff's house to arrest him and send him to Juvy, Jeff's brother lied and told them he was the one who attacked the kids. Jeff tried to tell them his brother was lying but no one believed him.
During a party at one of his neighbors, the bullies came back for Jeff and he had no choice but to defend himself again. This time the bullies brought with them guns but the leader of the bullies wanted to fight Jeff one on one. Jeff ended up killing the leader with a very hard punch on his chest that caused the leader's heart to stop. After that the other two tried shooting at Jeff but they missed him as he ran up the stairs. The three of them ended up fighting in the bathroom and a tub of bleach fell down from the shelf and soaked Jeff. Jeff killed the two bullies with a towel rack, when one of the bullies was dying he lit a lighter and threw it at Jeff who was soaked with bleach and alcohol (he got soaked with Vodka while fighting the leader).
He was able to live but his face has changed drastically, also his personality. He went mad. So he ended up killing his family and now he's a killer.
Poor Jeff was all I can think of while reading the story. However, he did show signs of craziness early on. He felt happy after the first time he fought the bullies and it was during their second fight that he snapped.
The version of Jane that I read was that Jane was a neighbor of Jeff and Jane wanted to help Jeff. She was the one who saved Jeff from burning up by bringing a fire extinguisher but Jeff wanted Jane to join him, be like him. So he killed her family and friends the same night he killed his family. Jeff also doused Jane with bleach and alcohol and lit her up but Jane's face wasn't bleached. I think it turned brown or something. So Jane is looking for Jeff, shes want to kill him for what he'd done to her.
Now back to Slendy.
I prefer Slender Man because he doesn't have a background story, at least to my knowledge, which is why I find him creepier. I haven't gone looking for his background story and I hope there aren't any. xD
I keep envisioning him to look something like that pale dude from Prometheus (which I've never seen) during the waterfall scene, minus the face. 
A nekkid Slender is not really scary after all. 
I plan on trying to read it again tomorrow while at work and procrastinating. 
I'll have to watch it tonight after I get off work since it's probably not a good idea to watch it in the office. 
If it's the white dude with the muscles, that's not Slenderman; it's some weird guy from the movie Prometheus which had something to do with Xenomorphs from what I've heard. 
I wonder if it's because of this story that he has so many supporters and stuff...I think there was something about his brother dying in 2016 or some other? And his brother has a bizarre name. Not sure what ethnicity Jeff's family are but unless his brother was adopted...Liu is a really weird name for someone who I think is Caucasian.