We tried to warn you.
If you couldn't watch that (the video might be blocked in some states with particularly strict bestiality laws), don't worry, we can describe the rat-fucking action for you. We open with some scientists in Nintendo's lab testing to see if a rat would prefer a Game Boy to a slice of cheese to determine "how addictive [Nintendo consoles] truly are," because that makes sense.
"Rats. Kids. What's the difference?"
The rodent scurries around a bit before deciding to beeline it right to the Game Boy, even climbing over a wall, not giving two shits about the rules. Then he arrives at his choice, and it turns out that the rat doesn't like the Game Boy -- he really likes it. Hard. Enjoy this GIF that Nintendo inexplicably filmed.
The new Game Boy: Half the size! Twice the rat jizz!