I don't watch the Scooby-Doo! Mystery Incorporated animated series, but they actually had an episode in which they spoofed the classic David Lynch TV series Twin Peaks. The scene was sure to freak out any kid watching it. Even as an animated TV series it's still pretty trippy.
If you have never watched Twin Peaks, you need to get on that! That series was awesome! It's available on Netflix and Hulu. So you really don't have any excuse not to watch it.
I just want to clarify that this scene was actually in the series and is not fan made.