Number Five: Two way mirror with a picture of a Wraith in the middle of the two layers. (It'll make more sense in the situation, I promise)
McCay was feeling ambitious and wanted to play a joke on Ronon (Man, it's just pick on Ronon week, isn't it?). He went into a room with a two-way mirror, and somehow managed to put a picture of a Wraith's face in it (don't ask me how; I don't know…figure it out yourself) so that whoever looked into the mirror would see a Wraith's face instead of their own. He then walked to the other side of the mirror and sat down to wait.
Ronon came into the room, and looked into the mirror. He saw a Wraith, and immediately shot the mirror four or five times in a row. The bullets traveled through the mirror, killing McCay, who died laughing maniacally at the joke.
