9/11 Crash

Okay, listen up, you joke-making goof. You probably think you're so clever, huh? You are using the phrase "crash and burn" which is a common idiom meaning to fail spectacularly. However, you're using it in the context of 9/11, which involved airplanes crashing into buildings and bursting into flames. The planes literally crashed and burned. So you're playing on the double meaning. It's a dark and morbid form of word play, you chucklehead.