The GTX 1080 Ti giveaway, of course.
Reminds me of this other scam topic where a small youtuber had a PS4 "giveaway", but made some inconsistent claims in regards to the photos he provided of the console, such as that it had never been used, or even booted up. But in the pictures you could spot the power and HDMI cables being hooked up. And the PS4 he used for the "giveaway" appeared to be the very same dusty PS4 he had a "giveaway" for several times earlier, on his Youtube channel.
I remember having some fun with that. I'll see if I can find a link to it later.