Santos to Barcelona
This doesn't look very fair. Neymar plus Leo Messi? How do you compete with that? It's going to be fun to watch, and interesting to see how the Brazilian copes with European football.
To be honest, he'll almost certainly be fine. He's a world class forward, all that really remains to be seen is how he fits into the Barca system. Recent high-profile big-money signings haven't worked out too well - Zlatan Ibrahimovic and Alexis Sanchez.