The Phoenix Saga (2): The Dark Shroud - S3-E4
Other mistake: After the shuttle crashes into the Upper New York Bay, the X-Men escape the wreckage and swim up to the surface, with Wolverine being the first one to appear. Given that Wolverine's skeleton is coated with a heavy metal, not only should he not be the first one to surface, he should actually sink instead. (00:04:06)
Answer: "This" happens to be used in computer programming language to refer to an entity that is part of a currently running code. But that is just a guess, or at least a starting point for a discussion.
Bishop73