Trivia: While he enjoyed the finished film, star Bill Paxton admitted he wished "Twister" was a bit darker and edgier. For a while around 2010, he tried to get a sequel off the ground to deliver this more intense vision, and he was even interested in potentially directing the follow-up. Little is known about what the sequel would have been about, although Paxton hinted he wanted to utilize 3D filming techniques (which had been re-popularized by James Cameron's "Avatar") to really put the audience into the tornado chases. Unfortunately, the sequel never came together.
Trivia: According to the Special Effects documentary, the sound of the tornado was produced by recording a camel's moan and digitally slowing it down.
Answer: No double meanings. Jo just sees the lethal-looking farm equipment (which is ordinary equipment that many farmers have) and in her panicked state wonders who would have such dangerous things in their barn, as though they were serial killers or something. Bill's "I don't think so!" just means they're not hiding in the barn where they could get impaled or decapitated at any second.
Krista