What happens? Bad news, that's what happens. My favorite part is the older brother's plaintive plea at the end: "Why do they even make Baby Lightsabers?!"
For the record, the title of the video is "Darth Baby's Lightsaber;" I bring it up only to point out that Darth Baby is still a less stupid name than Darth Sidious.
[Via Geek Tyrant]