Now, you must also become familiar with LARP, Live Action Role Playing. This is when people dress up in costumes to act out scenes from what you might see in some fantasy game or something. (If you search for LARP on YouTube, you'll get some good examples. "LIGHTNING BOLT!!")
A LARProll is starting to become popular on the discussion forums for the MMORPG The Lord of the Rings Online (it may be on other MMO forums too, but I wouldn't know). It is when people post a link saying that it is really cool in-game footage but turns out to be a LARP video.
runekeeper in-game video http://www.youtube.com/watch?v=tB8VMNymEPA
These were both LARProlls that I have come across.