You manage to throw it correctly, but when it comes back a loved one unknowingly stands in the way of it and...well...you'll wish you never threw that boomerang in the first place.
Training becomes 10 times essayer, but pokemon become so OP that they reach sentience, and take over the internet causing "Robots take over the world scenario #654."
I wish for a free PS4, and all the games the games for it ever. (Games given to me as they are released)