sdbro3 is an air traffic controller. he was talking to some guy one time and the guy asked how to tell the difference between chemtrails and contrails. he said he didn't know (he didn't know that chemtrails were a thing). later he googled "chemtrails" and realized he'd just inadvertantly lumped himself in with crazy people. has to avoid that crazy guy for the rest of his life now. probably best to avoid him anyway though.