The Creeping Terror/YMMV

"Mike: The "creeping" part is apt, but the "terror" is just not happening."
 * Hell Is That Noise: Pretty much all the sounds made by or related to the Creeping Terror monster. The roars it makes and the sounds it makes when devouring it's prey are disturbingly inhuman and the screams the characters make when getting eaten range from normal screaming to a bizarre sound once eaten.
 * Nightmare Retardant

"Mike: Hey, there's bullets in the other end of that thing!"
 * Special Effect Failure: The titular "terror" is a space creature who eats people has people climb up into its maw.
 * A monster made primarily out of carpeting. Supposedly, the people operating it often suffered from heatstroke.
 * Troubled Production: The original monster design was lost, the original soundtrack to the movie was lost (a debunked rumor was that it was lost in Lake Tahoe), there were arguments between Allan Silliphant and Vic Savage over the direction of the film, and Savage himself being sued for fraud before the film's release!
 * What an Idiot!: In an attempt to stop the transmission of humanity's biological data, Martin rushes into the UFO, loaded gun in hand--then tries to pistol-whip the computer. Needless to say, this doesn't work.