I felt rather on the fence with this short animated loop. It could be funny if you find jokes involving scat funny at least. However, I do feel some things are missing which keeps this from being a much better piece than it could be.
First, there is no preloader or ending frame. Sure, it is a loop but I think a preloader would be nice so that it goes back to a frame and stops instead of playing over and over again. That or an ending frame would be nice as well showing you made this and if you found the sounds somewhere or made them yourself.
Second, no buildup. There was almost no buildup to Slenderman tripping on that squirrel's feces. Also if you took it a step farther it could have been more funny since Slenderman apparently does not walk (unless you happen to see him doing so in the DarkHarvest00 series). He could have looked down at the squirrel and devoured it or did something to it rather than tripping on the feces and punching the ground in a "not my kind of moment" way.
Third, no atmosphere. Sadly there was seemingly no background sound like a forest would have during the night or day time. That and since it seems Slenderman is walking forward at the start some audio distortion could have played up well here given that any time it is seen the video and audio always distorts.
Overall, it is a nice little loop but if you slow down and take more time working on this it could have been much, much better than it is. Have fun with future animations.