I learned a valuable lesson today. One must be very careful with the "duplicate" feature, especially on larger designs. If one accidentally duplicates a large section of one's design, the game may slow down and one may become impatient. One may click the mouse 7 or 8 times because of said impatience. One might end up with something like this: If one attempts to launch the pictured monstrosity, this might be the result: Here's a video:
I actually had to reduce the overclock on my computer to make that video, to stop it from overheating. You're welcome.