have you seen the fake live-action Thundercats trailer, with Brad Pitt, Vin Deisel and . . . i dunno, other people? it's pretty cool. i think they use CGI Garfield as Snarf.
It made me happy in my pants.
Hey, it just occurred to me that an obvious nickname for a fake trailer would be a "failer". Larf.
Aaaaand on the subject, here's a fake - if surprisingly well-made - trailer for a non-existent movie version of the old British comic Slaine: The Horned God
. I think it's awesome, but being familiar with the character probably helps.
(It's in Spanish with subtitles, but being based on Celtic mythology, that makes an odd sort of sense.)