The two stick-figure alien videos, this on and the one from Fresno, California linked here, are both probably videos of similar anomalous creatures. The individual who was originally given the Yosemite video has done some interesting work on it that reveals the probable size of the creatures that were approaching the house. The couple who lives there had set up a surveillance camera because they had been experiencing suspicious activity around their house at night.

These are among the very few videos that might actually portray unknown creatures acting in an intelligent matter. They are also among the strangest paranormal videos ever made.

Story Source:
http://www.youtube.com/watch?v=VHsEr_9IIVM&feature=iv&annotation_id=annotation_229440