Beginning of the End (1957)
Low-budget sci-fi/horror flick about hungry, gigantic, mutant locusts with a taste for human flesh. The locusts grow to enormous proportions after eating plants which were created in an experimental agricultural lab which was using radiation to grow vegetables and fruits into oversized specimens. This one sort of falls into the "so bad it's good" category, but it was just so genuinely bad overall that I couldn't rate it any higher than 2 out of 5 stars. The poster for the movie gets a solid 5/5 stars from me, though.