Yet another drive-thru prank video from Rahat:
It's clear a lot of drive-thru employees are getting used to these pranks end enjoy them. On the other hand, I can see why some of them would be shocked. After all, working the drive-thru window at a fast-food place, you're much more used to seeing a fat man.
If you're not familiar with the Slenderman urban legend, see the Wikipedia entry here.