Killdozer is a B Movie
which had the unintentional by-product of being totally hilarious.
A meteorite with special powers crashes onto an island where there is a crew of construction workers using giant D-9 bulldozers. The crew is forced to move the newly arrived meteorite with one of the bulldozers, but to their horror the meteorite transfers some special powers to the machine, causing it to come alive and go on a murderous rampage. Eventually the surviving construction workers are able overcome the awesome power of the killdozer, and escape to safety.
While utterly stupid, the movie holds similarities with movies like The Terminator, or Jurassic Park, where man's creations become too powerful for him to control, and is forced to suffer the consequences of his actions.